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data brief for further information contact your local stmicroelectronics sales office. october 2009 doc id 16524 rev 1 1/11 11 STPMS1 smart sensor dual-channel first-order sigma-delta modulator with embedded pga features v cc supply range: 3.2 v - 5.5 v two first-order sigma-delta ( ?) modulators programmable chopper- stabilized low noise and low offset amplifier supports 50-60 hz, iec 687/1036 spec for class1 ac watt meters less than 0.1% error over 1:1000 range internal low drop regulator at 3 v (typ.) precision voltage reference: 1.23 v and 30 ppm/c max. applications power metering adc converters description the STPMS1, also called a ?smart sensor? device, is an assp designed for effective measurement in power line systems utilizing the rogowski coil, current transformer or shunt principle. it is used in combination with the stpmc1 programmable poly-phase energy calculator ic, as a building block for single-phase or multi-phase energy meters. the STPMS1 is a mixed signal ic consisting of an analog and a digital section. the analog section consists of one preamplifier and two first-order ? modulator blocks, band-gap voltage reference, a low-drop voltage regulator and dc buffers, while the digital section consists of a clock generator and output multiplexer. qfn16 (3 x 3 mm.) table 1. device summary order code package packaging STPMS1bpqr qfn16 (3 x 3 mm) 2500 parts per reel www.st.com
contents STPMS1 2/11 doc id 16524 rev 1 contents 1 general operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STPMS1 general operation description doc id 16524 rev 1 3/11 1 general operation description the STPMS1 performs a/d conversions of analog signals on two independent channels in parallel. there is a current channel for measuring line current and a voltage channel for measuring line voltage. the converted ? signals are multiplexed in time to reduce the number of external connections. the conversion and the multiplex are driven by an external clock signal which has twice the frequency, as it is used to strobe the analog inputs. the voltage channel is connected externally and differentially to a line voltage divider which provides an analog signal proportional to the voltage v. the current channel is connected to a rogowski coil, or to a current transformer (ct) or shunt, which are used to interface the line current. the coil provides an analog signal proportional to di/dt, while the shunt or ct provides an analog signal proportional to the current i. there should be an anti-aliasing lp filter of f c = 5 khz inserted between the sensors and the inputs of both channels of the STPMS1. a ct differs from shunt in sensitivity and phase error. internally, the differential voltage of the voltage channel is connected directly to the a/d converter, which implies a preamplification of x4 and uses a 0.6152 v reference voltage. on the other hand, the differential voltage of the current channel is connected to a x4 preamplifier first and the output of this preamplifier to the similar a/d converter, which implies selectable preamplification of x2 or x8 and uses the same reference voltage. a pair of digital inputs (ms0 and ms1) is used to select the configuration of device.
schematic diagram STPMS1 4/11 doc id 16524 rev 1 2 schematic diagram figure 1. block diagram cip cin vip vin vcc pga 2x, 8x 1 st ord ? modulator ord ? modulator ldr vdd vss bias ref digital front end ms1 clk dat ms0 datn 1 st cip cin vip vin vcc pga 2x, 8x 1 st ord ? modulator ord ? modulator ldr vdd vss bias ref digital front end ms1 clk dat ms0 datn 1 st
STPMS1 pin configuration doc id 16524 rev 1 5/11 3 pin configuration figure 2. pin connections 1 gnd vdd gnd ms0 vdd vdd ms1 vdd vcc datn clk dat vin cin cip vip gnd 1 gnd vdd gnd ms0 vdd vdd ms1 vdd vcc datn clk dat vin cin cip vip gnd table 2. pin description pin symbol description 1 vdd output of internal +3.0 v low drop regulated power supply 2 gnd ground level for signals and pin protection 3 vdd output of internal +3.0 v low drop regulated power supply 4 gnd ground level for signals and pin protection 5 cip current channel + 6 cin current channel - 7 vip voltage channel + 8 vin voltage channel - 9 vdd output of internal +3.0 v low drop regulated power supply 10 vdd output of internal +3.0 v low drop regulated power supply 11 ms0 input for configurator 0 12 ms1 input for configurator 1 13 clk input for external measurement clock 14 dat output of multiplexed ? signal 15 datn output of multiplexed ? signal negated 16 vcc unregulated supply voltage for padring, band gap, low drop and level shifters exp pad gnd ground level for signals and pin protection
application information STPMS1 6/11 doc id 16524 rev 1 4 application information note: the above-listed components refer to a typical metering application. operation of the STPMS1 is not limited to the choice of these external components. figure 3. application schematic table 3. list of external components component description value tolerance unit calculator stpmc1 - - - - divider interfaces the line voltage 1:780 1% 50 ppm v/v rogowski coil interfaces the line current 3 12% - mv/a ct interfaces the line current 30 12% - mv/a shunt interfaces the line current 0.2 5% - mv/a
STPMS1 package mechanical data doc id 16524 rev 1 7/11 5 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package mechanical data STPMS1 8/11 doc id 16524 rev 1 dim. mm. inch. min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 0.0 3 1 0.0 3 5 0.0 39 a1 0 0.05 0.002 a 3 0.20 0.00 8 b 0.1 8 0. 3 0 0.007 0.012 d2. 9 0 3 .00 3 .10 0.114 0.11 8 0.122 d2 1.50 1. 8 0 0.05 9 0.071 e 3 .00 0.11 8 e2 2. 9 0 3 .00 3 .10 0.114 0.11 8 0.122 e 0.50 0.020 l0. 3 0 0.50 0.012 0.020 qfn16 ( 3 x 3 mm.) mechanical data 7509604/c
STPMS1 package mechanical data doc id 16524 rev 1 9/11 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 7 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 mm.) mechanical data
revision history STPMS1 10/11 doc id 16524 rev 1 6 revision history table 4. document revision history date revision changes 23-oct-2009 1 initial release.
STPMS1 doc id 16524 rev 1 11/11 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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