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U3761MB-T
Universal Telephone IC - All Functions Integrated
Description
Atmel Wireless & Microcontrollers' low-voltage telephone circuit U3761MB-T performs all the speech and line interface functions required in an electronic telephone set, the tone ringer, the pulse and DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is possible with reduced performance. Electrostatic sensitive device. Observe precautions for handling.
Features
Speech Circuit
D Adjustable DC characteristic D Symmetrical input of microphone amplifier D Receiving amplifier for dynamic or piezo-electric earpieces D Automatic line-loss compensation D Ten by 17 digits indirect (two-touch) memory D Notice function up to 32 digits D Standard low-cost crystal 3.58 MHz or ceramic resonator D Handset Mute (Privacy) with optical indication D Additional toggle flipflop D Internal loop interrupt detection
Dialer
D DTMF / pulse switchable D Pulse dialing 66/33 or 60/40 or DTMF dialing selectable by pin D Selectable flashing duration by key pad D Pause function D Optical indication of temporary DTMF mode D Keytone for pulse dialing D Last number redial up to 32 digits D Three by 17 digits direct (one-touch) memory
Tone Ringer
D 2-tone ringer D Adjustable volume D RC oscillator D Adjustable threshold
Benefits
D Low number of external components D High quality through one IC solution
Ordering Information
Extended Type Number U3761MB-TFN U3761MB-TFNG3 Package SSO44 SSO44 Tube Taped and reeled Remarks
Rev. A3, 06-Mar-01
1 (26)
U3761MB-T
Tip
Block Diagram / Applications
2 (26)
VI 100 k W HKS 1a 470 W 5 MW 3 kW HKS 1b 75 V Ring 33 k W 220 kW Next to VDD and GND 220 mF 18 kW 220 nF 220 nF 2N5401 CL 2.2 nF XT 2.2 m F CLIM VL HKS MODE PRIND Mask DP VDD MFO MIC1 MIC2 MICO TIN 13 V/ 1W MPSA42 LED 4.7 V 470 nF 1 mF 1 kW
3.58 MHz
to key board matrix
XT
Clock generator
- +
Micro- phone amplifier Control function Sidetone amplifier
ST 2.4 kW
Transmit amplifier
*/T 0
Important note: Application examples have not been examined for series use or reliability, and no worst case scenarios have been developed. Customers who adapt any of these proposals must carry out their own testing and be convinced that no negative consequences arise from the proposals.
680 W 330W
Earth
KT
Mute control
3.3 nF
C1
C2
Pulse control logic
C3
Receiver attenuation
RECIN 2.2 m F
47 nF
C4
Read - write counter Supply current regulator Control function
Control logic
R1
1
2
3
S M1
Receiving amplifier
RECO1 1.8 kW 100 W RECO2 12 kW AGC RDC VI 39 W 1W 100 m F 300W
R2
4
5
6
M2
R3
Key- board inter- face RAM
7
8
9
A M3
R4
# R/P N
Figure 1. Block diagram / applications
Location latch Data latch & decoder D /A converter ROW & column programmable counter AGC current generator Supply Power on reset Clock signal oscillator Divider Tone signal generator Divider Bandgap reference Comparator with hysteresis
F1 F2 F3 E
VI
MFIND
4.7 V
MUTE VRING 10 m F 10 kW OUT
TEST
1 nF
RCK
150 kW
VRIAC 10 k W THA
HFI
Rev. A3, 06-Mar-01
HFO
Toggle flipflop
U3761MB-T
Pin Description
C1 1 C2 2 C3 3 C4 4 Earth HFI HFO 5 6 7 44 43 42 41 40 39 38 37 U3761MB-T XT 9 MFO 10 MFIND 11 GND 12 MIC 1 13 MIC 2 14 MICO 15 VL 16 RDC 17 TIN 18 VI 19 MUTE 20 PRIND 21 RECIN 22 36 35 34 33 32 HKS n.c. TEST VDD OUT R4 R3 R2 R1 Mask DP MODE KT
XT 8
31 RCK 30 VRING 29 VRIAC 28 AGC
27 THA 26 ST 25 24 23
Figure 2. Pinning SSO44
CLIM RECO 1 RECO 2
Rev. A3, 06-Mar-01
3 (26)
U3761MB-T
Pin 1 2 3 4 5 Symbol C1 C2 C3
C2-C4
Function Keyboard input
C1
Configuration
VDD
PD VDD
C4 Earth Earth key ( 604 ms high pulse, 1 s pause)
EARTH
PD = Protection Device VDD
6
HFI
VDD
PD
7
HFO
Output will be toggled by each LOW/ HIGH edge at HFI.
VDD
HFO
PD
8 9
XT XT
PD
VDD
PD
10
MFO
PD
4 (26)
Rev. A3, 06-Mar-01
E
MFO
E E
Output of DTMF DTMF output frequency Specified (Hz)Actual (Hz)Error (%) R1 697 699 +0.28 770 766 -0.52 R2 R3 852 848 -0.47 R4 941 940 -0.10 C1 1209 1216 +0.57 C2 1336 1332 -0.30 C3 1477 1472 -0.34
VDD
EE
XT
EE
A built-in inverter provides oscillation with an inexpensive 3.579545-MHz crystal or ceramic resonator
VDD
XT
VDD
VDD
VDD
200K
Toggle flipflop input Input with 200 kW pull-down resistor. HFI triggers HFO with each LOW/ HIGH edge.
VDD
HFI
E E E E
E
E E E E E
VDD
VDD
PD
U3761MB-T
11 MFIND Output switches to low being in temporary DTMF mode. Reset by on hook condition. Maximum voltage at MFIND = 5.5 V.
MFIND
12 13
GND MIC 1
Ground Inverting input of microphone amplifier
VI
14
MIC 2
Non-inverting input of microphone amplifier
50K
1V
MIC1 MIC2
50K 1V
MICO
PD
16
VL
Positive supply voltage input to the device. The current through this pin is modulated by the transmit signal.
VL
PD 16V
RDC
17
RDC
An external resistor (1 W) is required from this pin to GND to control the DC input impedance of the circuit. It has a nominal value of 39 W for low-voltage operation. Values up to 100 W may be used to increase the available transmit output voltage swing at the expense of low-voltage operation. Input to the line output driver amplifier. Transmit AGC applied to this stage.
AGC
PD
RDC
5.6K
TIN
PD
16V
Rev. A3, 06-Mar-01
E E
18
TIN
EE EE
15
MICO
Transmit pre-amp output which is normally capacitively coupled to Pin TIN
1V
5 (26)
E
E
E E
E E
Pin
Symbol
Function
Configuration
VDD
MFIND
PD
PD
VI
PD
VI
1V
16K
PD VL
PD
U3761MB-T
Pin 19 Symbol VI Function This internal voltage bias line must be connected to VL via an external resistor which dominates the AC input impedance of the circuit and should be 680 for an 600-W input impedance or 1.2 k for a 900- input impedance. Pin for testing Forcing MUTE to GND mutes the microphone and decreases the earpiece signal by typically 29 dB; no pull up circuit allowed. PRIVACY indication pin Open collector with minimum 1 mA drive current to GND when PRIVACY = active Receive amplifier input. The receiving amplification is regulated by an AGC. Output of the receive amplifier. Dynamic transducers with a minimum impedance of 100 W can be directly driven by these outputs. Configuration
VI
16V PD
MUTE
PD 6.7V
VL 6.7V PD
MUTE
21
PRIND
PRIND
22
RECIN
RECIN
60K
23 24
RECO2 RECO1
VL
RECO2 RECO1
PD
6.7V
25
CLIM
Time constant of anticlipping in transmit path. CLIM w 2.2 mF CLIM = GND: anticlipping inactive
VL IDC
CLIM
6V PD
26
ST
ST
16V PD
12K
THA
PD
6V
20K
6V
AGC
PD
RDC
6 (26)
Rev. A3, 06-Mar-01
E
28
AGC
The range of transmit and receive gain variations between short and long loops may be adjusted by connecting a resistor RAGC from this pin to (GND). This pin can be left open to set AGC out of action.
E E
E
E
27
THA
Ringer threshold adjustment
VRIAC 140K 1V
E
The output of the sidetone cancellation signal, which requires a balanced impedance of 8 to 10 times the subscribers line impedance to be connected to Pin VL.
E
60K
E E
1V PD
20
MUTE
30K
E E E
E
VBG VL
E E E
U3761MB-T
Pin 29 Symbol VRIAC Ringing supply
10K
Function
VRIAC
Configuration
70K 50V PD
30
VRING
DC supply voltage for the tone ringer is limited to 30 V with integrated Z-diode.
VRING
30V PD 6.5K
OUT
PD
50V
31
RCK
RC clock oscillator for ringer
3.4V
0.8V
RCK
PD
6V 6V
32
OUT
Buzzer output
VRING
PD 30V 200 6.5K
OUT
PD
50V
VDD
6V PD
6V
34
Test
Test input with 6.25 kW pull-up resistor
TEST
VDD
VDD
VDD
PD
35 36
n.c. HKS
Not connected
HKS
PD
Rev. A3, 06-Mar-01
E
E
Hook switch input. HKS = 0: On-hook state. Chip in sleep mode, no operation (external pull-down resistor recommended). HKS = 1: Off-hook state. Chip enable for normal operation. IHKS 0.5 mA
VDD
6.25 k
7 (26)
E
33
VDD
Supply output for dialer part
E
200 VL
E E E
E E
E E E
U3761MB-T
37 KT Keytone output signal which is sent out in pulse dialing mode with a keytone frequency of 582 Hz. KT sink/ drive current is about 100 mA at VDD = 2.5 V Pulling MODE pin to: C3 tone mode with 87 ms burst time and 140 ms pause C4 tone mode with 87 ms DTMF burst and 87 ms pause R1 pulse mode with 20 pps, Make/Break = 40/60 R2 pulse mode with 20 pps, Make/Break = 33/66 R3 pulse mode with 10 pps, Make/Break = 40/60 R4 pulse mode with 10 pps, Make/Break = 33/66 C1 pulse mode with 10 pps, Make/Break = 33/66 and temp. DTMF with 87 ms DTMF burst, 140 ms pause MODE pin pulled to R4: with temporary DTMF, 87 ms DTMF burst and 87 ms pause Pulse dialing output. Flash key will cause DP to be active in either DTMF mode or pulse mode. In on-hook state is DP = VDD.
KT
PD
38
MODE
VDD
MODE
PD
39
DP
VDD
DP
MASK
41 42 43 44
R1 R2 R3
Keyboard input
R1
VDD
PD
VDD
R2-R4
R4
PD
8 (26)
E
40
Mask
Short mute during pulse dialing, active high During MASK an internal npn-transistor shortens VL against VI.
E E E
VDD VDD
E
E
E E
E E E E E E
Pin
Symbol
Function
Configuration
VDD
VDD
VDD
PD VDD
PD
Rev. A3, 06-Mar-01
U3761MB-T
D S: Store function key
D A: Indirect repertory dialing function key (LN 0 to 9) D R/P: Redial and pause function key D N: Notice function
Normal Dialing
OFF HOOK
1. 2. 3.
D1, D2, ..., Dn will be dialed out. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. If redialing length oversteps 32 digits, the redialing function will be inhibited.
Redialing
AA A A A AA AA A A AA A A A A A AAAAA AAAAA AAAAA AAAAAAAAAAAAA AAAA AAAA AAAAA AAAAA AAAAAAAAAAAAA AAAA AA AA AA A A AA A A A A A AAAAA AAAAA AAAAA AAAAAAAAAAAAA AAAA A AA AA AA A A AA A A A AAAAA AAAAA AAAAA AAAAAAAAAAAAA AAAA AAAAA AAAAA AAAAA AAAAAAAAAAAAA AAAA A AA A AA AA AA AA AA A A AA A A A A A AA A A A A
OFF HOOK
The R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it executes the pause function (3.6 s). Keys stored in redial memory: 0 to 9, #, R/P, A, M1, M2, M3, N, * (only tone mode)
Characters F1, F2, F3, Earth, ( * in pulse mode ) can only be stored in Mn, Ln and N memory. Characters F1, F2, F3, Earth, ( * in pulse mode ) will not be dialled out from redial-memory; dialling out was stopped, when recognizing one of the above characters. Example: OFF/ HOOK , D1, D2, F1, D4, D5, S, S, M1 a) ON/OFF-HOOK, R/P b) ON/OFF-HOOK, M1 only D1, D2 will be dialed out, then dialing out stops D1, D2, F1, D4, D5 will be dialed out
Content of redial memory can be copied to Mn, Ln, N; but copying memory Mn, Ln, N to itself or to another memory (ecxept redial memory) will erase the destinated memory.
Rev. A3, 06-Mar-01
AAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA AAAAA AAAA AAAA AAAA AAAAAA A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A AAAAA AAAA AAAA AAAA AAAA AAAAAA A A A A A A
C1 1 4 7 C2 2 5 8 0 C3 3 6 9 # C4 S M1 M2 M3 N R1 R2 R3 R4 A E :/T F1 R/P F2 F3 D :/T: : function; pulse-to-tone function D M1 to M3: One-touch memory D F1, F2, F3: Flash keys , D1 , D2 , ..., Dn , D1 , D2 , ..., Dn BUSY, Come ON HOOK , OFF HOOK , R/P 9 (26)
Keyboard Operation
A A AA AA A A A A AAAAAAAAAAAA AAAAA A A AA AA A A AAAAAAAAAAAA AAAAA AAAAAAAAAAAA AAAAA A A AA AA A AAAAAAAAAAAA AAAAA A AA AA A A
U3761MB-T
Example: OFF/ HOOK, D1, D2, ... Dn a) ON/OFF-HOOK, R/P, N . b) ON/OFF-HOOK, R/P, S, S, Mn ( or Ln) but OFF/ HOOK, M1 a) ON/OFF-HOOK, R/P, S, S, M2 b) ON/OFF-HOOK, M1, S, S, M2 content of M1 will be dialed out not possible, M2 will be erased not possible, M2 will be erased D1, ... Dn copied to N D1, ... Dn copied to Mn (or Ln)
Number Store
AAA AA A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AAA A A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AAA A A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AAA A A A AAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A AAA A A A A A A A A A AAA A A A A A AAA AA A A A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AA A A A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AA A A A A A AAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A A AA A A A AAAAAAAAAAAAAAAAAAAAA AAAAA A A A A A A A A AA A A A A A A A A A AA A A A A A A A
OFF HOOK , D1 , D2 , ..., Dn , S , S , Mn (or Ln ) 1. OFF HOOK , S , D1 , D2 , ..., Dn , S , Mn (or Ln ) 2. 3. D1, D2, ..., Dn will be stored in memory location but will not be dialed out. R/P and :/T keys can be stored as a digit in memory, also F1, F2, F3, Earth. In store mode, R/P is the pause function key; :/T is the pulse-to-tone function key. 4. 5 Number store can be linked without going ON/OFF-Hook Example: OFF/HOOK S, D1, D2, ... Dn, S, M1 S, D1', D2', ... Dn', S, M2 ... storing D1, D2, ... Dn to M1 storing D1', D2', ... Dn' to M2
D1, D2, ..., Dn will be stored in memory location only (not in redial memory) and dialed out.
The store mode is released after the store function is executed or when the state of the hook switch is changed.
AAAAAA AAAAAAA A AAA A AA AAAAAA AAAAAAA A AAA A AA AAAAAA AAAAAAA AAAAAA AAAAAAA A AAA A A AAAA AAAAAAA AAA A AAA A A AA A AA AA AA AA AAAA AAAAAAA AAA AAAAAAA AA AA AAAA AAAAAAA AA A AA AAAA AAAAAAA AA A AA
1. 2. OFF HOOK OFF HOOK , , Mn A , Ln 10 (26) Rev. A3, 06-Mar-01
Repertory Dialing
AA AA AA A AA A AA A AAAAA AAAAAAA A AAAAAAAAAAAAA A A A AA AA AA AAAAAA AAAAA AAAAAAA A AA AA AA AA AAAAA A AA AAAAAA AAAAA AAAAAAA A A A A A A A A A AA AA AA A A A AA AA AA A AA AAAAA A A A A AA AA AAAAAA AAAAA AAAAAAA AAAAAAA AAAAA AAAAAAA A AAAAAA AAAAAAA A AAAAAA AAAAAAA AA AA A AA AA AAAAA AAAAAA AAAAAAA A A A AA AA AAAAA AAAAAA AAAAAAA A A A A AA AAAAA AAAAAA AAAAAAA AA AAAAA AAAAAA AAAAAAA A AAAAAA AAAAAA AAAAAAA A A A A A AA A A A AA AA AA AAAAA AAAAAA AAAAAAA A A A AA AA AAAAA AAAAAA AAAAAAA AA AAAAA AAAAAA AAAAAAA A A A A A A A A A AA
Cascaded Dialing
4. 3. 4. 3. 2. 1. Notice function is valid as first key only. D1 to Dn will be dialed out after the N key is pressed. Repertory dialing + Normal dialing Normal dialing Redialing is valid as first key-in only. Redialing + Normal dialing + Repertory dialing + Normal dialing + Repertory dialing + Normal dialing
A AA A A A AAAA AAAA A AA A AAAA AAAA A AA A A AAAA AAAA A AA AAAA AAAA AAAA AAAA AA
1. 2. OFF HOOK OFF HOOK If the dialing of D1 to the N memory. , , D1 N ,
AAAA A AAA A A A A A AAAAAAAAAAAAA AAAA AAAAAAAAAAAAA AAAA AA A A AA A A A AAAAAAAAAAAA AAAA A A A AA A A A A A AAAAAAAAAAAAA AAAA AA A A AA A A A AAAAAAAAAAAAA AAAA AA A A AA A A A A
Notice (N)
D2 to Dn , ..., Dn , N
Rev. A3, 06-Mar-01 Pressing key N again, after D1, D2, ... Dn was copied to N, N will be dialed out again is finished, pressing the N
key will cause D1 to Dn to be copied
U3761MB-T
11 (26)
U3761MB-T
HKS tKRD KEY IN 3 tKID DP tIDP MUTE
BM
4
2
2 tKID
tPDP
tIDP
BM
tIDP
tPDP
tIDP
MASK Low
MFO
OSC
Oscillation
Figure 3. Pulse mode normal dialing
HKS tKRD KEY IN R/P tKID DP
BM
ttPDP MUTE
tIDP
BM
tIDP
tIDP
MASK Low
MFO
OSC
Oscillation
Figure 4. Pulse mode auto dialing
12 (26)
Rev. A3, 06-Mar-01
U3761MB-T
HKS tKRD KEY IN R/P tKID DP
BM
t > tOHD
tPDP MUTE
tIDP
BM
tIDP
MASK Low
MFO
OSC
Oscillation
Figure 5. Pulse mode auto dialing
HKS tKRD KEY IN 3 tKID DTMF MUTE tTD tITP tITP tITP 4 2 5
MASK DP
Low High
OSC
Oscillation
Figure 6. DTMF mode normal dialing
Rev. A3, 06-Mar-01
13 (26)
U3761MB-T
HKS tKRD KEY IN R/P tKID DTMF MUTE tTD tITP tITP tMASK DP
Low High
OSC
Oscillation
Figure 7. DTMF mode auto dialing (tttOHD)
HKS tKRD KEY IN R/P tKID DTMF MUTE tTD tITP t > t OHD
MASK DP
Low High
OSC
Oscillation
Figure 8. DTMF mode auto dialing (tutOHD)
14 (26)
Rev. A3, 06-Mar-01
U3761MB-T
Access Pause
AA A A A AA A AA A A A A A AAAAAAAAAAAAAAAAAAA AAAAA A A A A AA A AA A A A A AAAAAAAAAAAAAAAAAAA AAAAA A A A A AA A AA A A AAAAAAAAAAAAAAAAAAA AAAAA AAAAAAAAAAAAAAAAAAA AAAAA A A A A AA A AA A A AAAAAAAAAAAAAAAAAA AAAAA A A A AA A AA A A A
OFF HOOK , D1 , D2 , R/P , D3 , ..., Dn' 1. 2. The pause function can be stored in the memory. The pause function is executed in normal dialing and redialing. HKS KEY IN tKID DP tPDP MUTE tP MASK Low tPDP 2 R/P 3 tIDP MFO OSC Oscillation
Figure 9. Pause function
Rev. A3, 06-Mar-01
15 (26)
U3761MB-T
Pulse-to-Tone (:/T)
AA A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA A A A A A A AA A A A AA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA A A A A A A AA A A A AA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA A A A A A A AA A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA A A A A A AA A A A AA A A A A A A A AA A A A AA A A A A
OFF HOOK , D1 , D2 , ..., Dn , :/T , D1' , D2' , ..., Dn' 1. If the mode switch is set to pulse mode, then the output signal will be: D1, D2, ..., Dn, Pause (3.6 s), D1', D2' ,..., Dn' (Pulse) 2. (Tone) If the mode switch is set to tone mode, then the output signal will be: D1, D2, ..., Dn, (Tone) 3. 4. 5. * (Tone) , D1', D2', ..., Dn' (Tone) The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode by going on-hook only. ON/OFF-HOOK, R/P D1, D2, .... Dn dialed out, then further dialing out stops and remains in pulse mode, when dialling from redial memory. If characters are stored in Mn, Ln or N, dialing out be the same in pulse mode as point 1. HKS KEY IN tKID DP tPDP MUTE tP MASK tIDP 2 */T 3 MFO OSC MFIND
Figure 10. Pulse-to-tone operation
Oscillation
16 (26)
Rev. A3, 06-Mar-01
U3761MB-T
AAA A A A A AAAAA AAAAA AA A A AAAAA AAAAA AAAA AAAAA AA A AAAAA AAAAA AA A AAAAA AAAAA AA A A
OFF HOOK , Fn 1. 2. 3. HKS KEY IN F tKID DP MUTE MASK MFO OSC tKID tKRD tPDP tIDP tTD = key active in debounce = key release debounce = pre-digit pause = inter-digit pause = DTMF output duration KEY IN DP MUTE MASK EARTH Rev. A3, 06-Mar-01
Flash (F1 or F2 or F3)
The dialer will execute flash break and the entire flash pause time will elapse before the next digits are dialed out. The flash key can be stored as a digit in the memory. Only one flash, however, will be released to the users. The system will return to the initial state after the flash pause time has elapsed. High
F tFB tFP
3
tFP
tITP Oscillation
Figure 11. Flash operation
tITP tFB tFP tP
= = = =
intertone pause flash break time flash pause time pause time
Low
Figure 12. Symbolic timing diagram: Earth function
17 (26)
U3761MB-T
HFI HFO
Figure 13. Symbolic timing diagram: HFI, HFO function
Off hook HKS On hook
XT 165 ms
Figure 14. Symbolic timing diagram: on hook debounce time
60 HKS threshold ( % of VDD ) 55 50 45 40 35 30 2.0 2.5 3.0 3.5 4.0 VDD/V 4.5 5.0 switch off switch on
Figure 15. HKS threshold voltage
Absolute Maximum Ratings
Parameters Line current DC line voltage DC voltage at Pins 1 to 11 and 33 to 44 Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60C Junction ambient SSO44 SSO44 Symbol IL VL VDC Tj Tamb Tstg Ptot RthJA Value 140 14 5.5 125 -25 to +75 -55 to +150 0.9 70 Unit mA V V C C C W K/W
ESD withstand voltage 1 kV according to ESD standard S5.1 (HBM)
18 (26)
Rev. A3, 06-Mar-01
U3761MB-T
Electrical Characteristics: Speech Circuit
Reference point Pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 / 1 W, Tamb = 25C, unless otherwise specified, refer to "Basic Test Circuit". CLIM = GND Parameters Line voltage Test Conditions / Pin IL = 8 mA IL = 20 mA IL = 73 mA IL = 100 mA Ri IL = 20 mA, S5 = open IL = 20 to 60 mA RAGC = infinite Tamb = -10 to +60C IL = 20 mA RAGC = 12 kW, IL = 73 mA IL = 20 mA, S5 = open IL = 20 mA, Vmic = 10 mV, CLIM = 2.2 mF, S1 = open CLIM = 2.2 mF IL > 20 mA, GS = 48dB ILy 20 mA Symbol VL 3.6 5.9 6.9 Ri Gs DGS DGS DGs dt VLmax tatt no GSTA VL VL PPRE 10 1.3 -7.6 1.9 2.5 -4.6 3.1 15 45 46.8 -0.5 -0.5 -7 -6 Min. Typ. 1.4 3.85 6.55 Max. 4.1 7.2 8.2 120 48.8 0.5 0.5 -4.8 2 Unit V V V V k dB dB dB dB % dBm ms - 72 20 dBmp dB dBm dBm dB
Transmit and sidetone Input resistance Gain Gain change with current Gain deviation Line-loss compensation Distortion at line VL = 0.775 Vrms Max. output voltage at line d x 5% Attack time transmit anticlipping Noise at line weighted psophometrically Sidetone reduction DTMF amplifier Volume range d < 5%
80 47.8
1.2 3.5
Single tone, IL w 20 mA DTMF output level low IL = 20 mA, S5 = closed frequency group Tamb = -5C to +60C Pre-emphasis between PPRE = PHLG - PLLG, high- and low-level S5 = closed, frequency group Tamb = -5C to +60C Total harmonic distortion IL 20 mA, measured at relative to sum level of low Pin MFO and high frequency group signal Receiving amplifier Gain IL w 20 mA Gain change with current Gain deviation Line-loss compensation IL = 20 to 60 mA RAGC = infinite Tamb = -10 to +60C IL = 20 mA IL = 73 mA
THD
-33
-25
dBr
GR DGR DGR DGR
3 -0.5 -0.3 -7 -6
5 0.5 0.7 -4.7
dB dB dB dB
Rev. A3, 06-Mar-01
19 (26)
U3761MB-T
Electrical Characteristics: Speech Circuit (continued)
Parameters Receiving noise at earphone weighted psophometrially Gain change when muted Output voltage push-pull Test Conditions / Pin IL = 73 mA Symbol ni Min. Typ. -77.5 Max. -71 Unit dBm
IL y 20 mA
GRM VRECO Vear
24 0.8 1.3
29 0.9 1.6
34
dB Vrms
IL y 20 mA, Zear = 68 nF, 100 W in series, d 2% Ear protection differential IL = 40 mA, Vgen = 4 Vrms, Zear = 68 nF + 100 W Supply voltage (for internal use only) Output voltage IL y 20 mA dialing mode
Note: Output must be limited externally to max. 5.5 V
2.5
Vrms
VDD
2.0
6.3
V
Available current for peripherals Transmit Maximum output voltage swing at line Mute suppression transmit with privacy function
IL y 20 mA dialing mode
IDD
150
mA
IL = 20 mA, VMIC = 50 mVrms IL = 20 mA
VL max GSPRIV 60
3.4
4
Vpp dB
DC Characteristics Dialer
VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameter Memory retention current Data retention voltage DTMF distortion DP output sink current Keyboard input drive current Keyboard input sink current Key on resistance Key off resistance Mask sink / drive current Earth sink / drive current Isolation resistance XT/XT Maximum voltage at HKS Maximum input current at HKS RL = 5 kW VPO = 0.5 V VI = 0 V VI = 2.7 V d IPL IKD IKS RKON RKOFF IM H/L Ie H/L Riso 100 0.5 0.5 4.7 5.5 0.5 0.5 20 500 5 Test Conditions / Pins HKS = 0, VDD = 1.0 V Symbol IMR 0.5 -30 -23 Min. Typ. Max. 0.1 Unit mA V dB mA mA mA kW kW mA mA MW V mA
20 (26)
Rev. A3, 06-Mar-01
U3761MB-T
AC Characteristics Dialer
VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameter Keypad active in debounce mode Key release debounce Pre-digit pause MODE pin = R3 (10 pps) MODE pin = C1, C4 (10 pps) MODE pin = R1 (20 pps) MODE pin = R2 10 pps, tIP = tIDP + tPDP 20 pps MODE pin = R1 (20 pps), R3 (10 pps) MODE pin = C1, R4 (10 pps) R2 (20 pps) Auto dialing, MODE = C4 MODE = C3 Auto dialing, MODE = C4 MODE = C3 C1 connected to GND C2 connected to GND C3 connected to GND 20 to 70% of VDD F1, F2, F3 Test Conditions / Pins Symbol tKID tKRD tPDP tPDP tPDP tPDP tIP tIP M/B Min. 15 15 37 31 Typ. 20 20 40 33.3 20 16.65 836 512 40:60 33:67 35.6:64. 4 84 84 84 135 95 245 590 31.2:68. 8 90 90 90 147 101 255 610 10 0.9 3.5 145 0.9 57.6 63 1 3.6 165 604 1 60 66.7 30 33.35 40 33.3 20 16.65 100 50 1.1 62.4 69 1.1 3.7 185 Max. 25 25 41 33.5 Unit ms ms ms ms ms ms ms ms % %
Inter-digit pause (auto dialing) Make/break ratio
810 40.8:60. 2
860 39.2:60. 8
DTMF output duration Inter-tone pause Flash break time F1 F2 F3 Rise time of leading edge at HKS Flash pause time Pause time On-hook debounce time Earth time Earth pause time Break duration
tTD tITP
87 87 87 140 98 250 604
ms ms
tFB
ms ms ms ms s s ms ms s ms ms ms ms ms ms ms ms ms ms
trHKS tFP tP tohd
C4 connected to GND MODE pin = R3 MODE pin = C1, R4 MODE pin = R1 (20 pps) MODE pin = R2 MODE pin = R3 MODE pin = C1, R4 MODE pin = R1 (20 pps) MODE pin = R2 MODE pin = C1, R3, R4 MODE pin = R1, R2 (20 pps)
tet tpt tB tB tM tM tP tP 95 38 31
Make duration
41 35
Break + make duration
105
Rev. A3, 06-Mar-01
21 (26)
U3761MB-T
Electrical Characteristics Tone Ringer
fRCK = 4 kHz, VRING = 20 V, Tamb = 25_C, reference point GND, unless otherwise specified Parameter Supply current, outputs open Switch-on threshold Switch-off threshold Ringing frequency Range of external compot f R/ C ill t Range of external compot f R/ C ill t Audio sequence frequency Output voltage swing Turn-off delay VRing = 25 V, Cout = 68 nF See figure 15 Test Conditions / Pins VRIAC = 20 V VRIAC, THA = open VRIAC R = 150 k, C = 1 nF VRIAC > VRON Symbol IRING VRON VROFF f1H f1L C R f2 Vout toff Min. 2.1 8 5.0 937 752 1000 50 11.5 21 12.5 23 65 100 9 5.6 1010 808 Typ. Max. 3.8 10 6.5 1083 868 2200 330 14.0 Unit mA V V Hz Hz pF kW Hz Vpp ms
Remark: Max. current into internal Zener Diode at Pin VRING = 20 mA
Volt VRING 0 VRIAC 0 OUT Melody t 0 toff
Figure 16. Turn-off delay time
t
t
Note
The oscillator frequency is defined by R and C at Pin RCK. f Osc [ 1.594 C 1 [R ) 3809 W] oscillator frequency by internal deviders. So f2, f1H and f1L are given by: f2 + fOsc f f ; f1H + Osc ; f1L + Osc 320 4 5
The audio sequence frequency f2 and the ratio of low frequency f1L and high frequency f1H are derived from
For more information of adjusting ringer melody see document "Application and Adjustment Hints "
22 (26)
Rev. A3, 06-Mar-01
To tester To tester VMIC VGEN 100 mV CL 100 m 1m 25k 600 S5 220n S8 S6 VDD VL 13V 4.7k S11 XT ST 47n RECIN VI RECO1 VRECO RECO2 AGC RDC PRIND VRING VRIAC OUT THA 68n VRIAC VRING 39
OUT I/O OUT I/O
ab S7 VGEN 300 mV / 1 kHz
To tester
To tester
To tester
Rev. A3, 06-Mar-01
VDD 8.2k 25k a S9 b
Basic Test Circuit
220 m
1m
IL
MIC1
MIC2
MFO
MICO
TIN
1.5k
VL
I/O
KT DP MODE HKS
IN
CLOCK
IN
2.2n
3.58 MHz XT
620
IN
Figure 17. Basic test circuit
IN
100 m 2.2 m
IN IN
IN
IN
U3761MB
330 12k
IN IN
S1
I/O OUT
OUT
OUT
C1 C2 C3 C4 R1 R2 R3 R4 MUTE MASK MFIND EARTH CLIM
To tester
2.2 m
150k
IN
1n GND
U3761MB-T
IN OUT
RCK TEST HFI HFO
23 (26)
U3761MB-T
Equations for Electrical Characteristic Parameters of the Speech Circuit
The equations refer to the basic test circuit. If not otherwise specified, the switches in the basic test circuit are inactive.
Transmit gain GS + 20 log VL VMIC
Receiving gain GR + 20 log VRECO VL
VMIC = 3 mV/1 kHz, S5 = open
RX-mode: Vgen = 300 mV/1 kHz, S7b
Line-loss compensation transmit DGS + GS(at I L + 73 mA)-GS(at IL + 20 mA) TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Sidetone reduction GSTA + 20 log VL (in TX-mode) ) GR VRECO
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Line-loss compensation receive DGR + GR(at I L + 73 mA)-GR(at IL + 20 mA) RX-mode: Vgen = 300 mV/1 kHz, S7b
Input impedance of microphone amplifier Ri + 50 k V L(S6 + closed) -1 VL(S6 + open)
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Gain change when muted GRM + 20 log V RECO (Mute + inactive)-20 VL log VRECO (Mute + active) VL
Vgen = 100 mV/1 kHz, S5 = open, S8 = open
Total Harmonic Distortion (THD) THD + 20 log n1 ULG ) n 1
2
U HG ) n 2
2
U LG ) n 2
2
U HG )AAA nn
2 2
ULG )n n
2
U HG
2
U LG ) U HG
2
n1, ... nn = harmonics of high and low frequency group
24 (26)
Rev. A3, 06-Mar-01
U3761MB-T
Packaging Information
Package SSO44
Dimensions in mm
18.05 17.80 9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications 13040
1
22
Rev. A3, 06-Mar-01
25 (26)
U3761MB-T
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
26 (26)
Rev. A3, 06-Mar-01

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