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data brief for further information contact your local stmicroelectronics sales office. october 2009 doc id 16525 rev 1 1/11 11 STPMS2 smart sensor ii dual-channel second-order sigma-delta mo dulator with embedded pga features v cc supply range 3.2 v - 5.5 v two second-order sigma-delta ( ?) modulators programmable chopper- stabilized low noise and low offset amplifier supports 50-60 hz, iec 687/1036 spec for class 1, class 0.5 and class 0.2 ac watt meters less than 0.1% error over 1:2500 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 STPMS2, also called a ?smart sensor? device, is an assp designed for effective measurement in a power line systems utilizing the rogowski coil, current transformer or shunt principle. the STPMS2 is a mixed signal ic consisting of an analog and a digital section. the analog section consists of one preamplifier and two second-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 (4 x 4) table 1. device summary order codes package packaging STPMS2h-pur qfn16 (4 x 4 mm) 4500 parts per reel STPMS2l-pur qfn16 (4 x 4 mm) 4500 parts per reel www.st.com
contents STPMS2 2/11 doc id 16525 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
STPMS2 general operation description doc id 16525 rev 1 3/11 1 general operation description the STPMS2 is a device designed to meas ure electrical line parameters (voltage and current) via analog signals from voltage sensors (current divider) and current sensors (inductive rogowski coil, current transformer or shunt resistors). the device is used together with a digital signal processing circui t in order to implement an effective measuring system of a multi-phase power meter. the device consists of two analog measuring channels, having second-order sigma-delta modulators with appropriate non-overlap control signal generator. the STPMS2 also includes a temperature compensated band-gap reference voltage generator, low-drop supply voltage stabilizer and minimal digital circ uitry that includes bist (built-in self-test) structures. in a current signal processing channel, a low-noise preamplifier is included in front of the sigma-delta converter. all reference voltages (band-gap, agnd) are internally buffered to eliminate channel crosstalk. the STPMS2 can operate in fast or low-power mode. in fast mode, a nominal clock frequency of 4.1 or 4.9 mhz is applied to the clock input. in this mode, signal bandwidth is specified between 0 and 4 khz. in low-power mode, the nominal clock is four times slower in order to lower the power consumption of the circuit. in low-power mode, the quiescent bias currents of the preamplifier and sigma-delta integrators are lowered and the signal bandwidth is narrowed to the frequency bandwidth of 0 to 1 khz.
schematic diagram STPMS2 4/11 doc id 16525 rev 1 2 schematic diagram figure 1. block diagram
STPMS2 pin configuration doc id 16525 rev 1 5/11 3 pin configuration figure 2. pin connections table 2. pin description pin symbol description 1 vcc unregulated supply voltage for padring, band gap, low drop and level shifters 2 vddac output of internal +3.0 v low drop regulated power supply 3 vdda output of internal +3.0 v low drop regulated power supply 4 vbg output of internal +1.23 v bias generator ; input of external precision reference voltage 5 cin current channel - 6 cip current channel + 7 vin voltage channel - 8 vip voltage channel + 9 vddav output of internal +3.0 v low drop regulated power supply 10 ms0 input for configurator 0 11 ms1 input for configurator 1 12 ms2 input for configurator 2 13 ms3 input for configurator 3 14 clk input for external measurement clock 15 dat output of multiplexed ? signal 16 datn output of multiplexed ? signal negated exp pad gnd ground level for signals and pin protection
application information STPMS2 6/11 doc id 16525 rev 1 4 application information note: the above-listed components refer to a typical metering application. operation of the STPMS2 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 divider interfaces the line voltage 1:780 1% 50 ppm v/v rogowski coil interfaces the line current 0.3 12% - mv/a ct interfaces the line current 2.4 12% - mv/a shunt interfaces the line current 0.2 5% - mv/a
STPMS2 package mechanical data doc id 16525 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 STPMS2 8/11 doc id 16525 rev 1 dim. mm. inch. min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 3 1.5 3 5.4 39 .4 a1 0.02 0.05 0. 8 2.0 a2 0.65 1.00 25.6 39 .4 a 3 0.20 7. 9 b 0.1 8 0.25 0. 3 07.1 9 . 8 11. 8 d 3 . 8 5 4.00 4.15 151.6 157.5 16 3 .4 d2 2.10 2.60 8 2.7 102.4 e 3 . 8 5 4.00 4.15 151.6 157.5 16 3 .4 e2 2.10 2.60 8 2.7 102.4 e 0.50 1 9 .7 l0. 3 0 0.40 0.50 11. 8 15.7 1 9 .7 ddd 0.0 83 .1 qfn16 (4 x 4) mechanical data 765 33 21a
STPMS2 package mechanical data doc id 16525 rev 1 9/11 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n 99 101 3 . 898 3 . 9 76 t 14.4 0.567 ao 4. 3 5 0.171 bo 4. 3 5 0.171 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx (4x4) mechanical data
revision history STPMS2 10/11 doc id 16525 rev 1 6 revision history table 4. document revision history date revision changes 23-oct-2009 1 initial release.
STPMS2 doc id 16525 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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