for further information contact your local stmicroelectronics sales office. march 2014 docid026138 rev 1 1/5 EVALSTPM32 single-phase energy metering evaluation board with shunt current sensor based on the stpm32 data brief features ? 0.2% accuracy single-phase meter ? v nom (rms) = 140 to 300 v, i nom /i max(rms) = 5/100 a, f lin = 50/60 hz 10% ? connector for usb isolated hardware programmer tool steval-ipe023v1 and pc gui ? rs232 and uart isolated connectors to pc gui ? spi/uart switch for device peripheral selection ? 2 programmable leds on board ? digital expansion to external system-on-chip or mcu ? 3.3 v power supply: external or through steval-ipe023v1 isolated usb board ? iec61000 standard compliant ? rohs compliant description the stpm32 energy metering evaluation board is a class 0.2, single-phase meter with shunt current sensor for power line systems with v nom = 140 to 300 v (rms) , i nom / i max = 5/100 a (rms) , f lin = 50/60 hz 10% and t amb = -40 to +85 c. measured active/reactive power can be output from two programmable leds on the board. the board can be interfaced with a pc running evaluation software through an isolated rs232 port, or through the steval-ipe023v1 usb isolated interface tool for configuration and data reading. the board also has spi/uart pins available to interface a microcontroller for application development. www.st.com
schematic diagrams EVALSTPM32 2/5 docid026138 rev 1 1 schematic diagrams figure 1. rs232/uart circuit schematic c4 100n u2 si8621 vdd1 1 gnd1 4 gnd2 5 vdd2 8 a1-in 2 a2-out 3 b2-in 6 b1-out 7 c3 100n j2 uart i/o 1 2 3 4 r1 10k c2 100n c7 100n sw1 sw dip-3 j1 rs-232 db9 1 6 2 7 3 8 4 9 5 c5 100n u1 max3232/so gnd 15 vcc 16 r1in 13 r2in 8 t2in 10 t1in 11 c1+ 1 c1- 3 c2+ 4 c2- 5 r1out 12 r2out 9 t1out 14 t2out 7 v+ 2 v- 6 c1 100n j3 rs-232 enable 1 2 c6 100n vcc vcc scs rxd txd 1 rxd 2 txd 3 +3.3vdc 4 gnd note: always provide supply for both rs232 and uart galvanic isolation all sws off select spi at power up all sws on select uart at power up gipg25032014di1545
docid026138 rev 1 3/5 EVALSTPM32 schematic diagrams 5 figure 2. metrology circuit schematic c10 10n r13 270k r19 0r r7 10k c18 150p l4 1500ohm dl2 led2 j6 spi 1 2 3 4 5 6 7 8 9 10 r12 270k r4 1m c17 15p c27 100n c15 150p c30 1u c29 100n c23 100u 10v j8 n 1 t1 4626-x002 j4 enable/rst 1 1 2 2 3 3 c20 4.7u c16 15p r18 1k c28 150p c14 150p r16 6r r3 100r j9 l 1 l2 1500ohm c21 150p dl1 led1 c24 22n r15 470r c13 150p c8 100n l3 1500ohm r10 10k r11 100r r17 1k r6 4.7k j5 digital i/o 2 4 6 8 1 3 5 7 r14 270k y1 16mhz c12 150p r2 22k l1 1500ohm r8 10k j7 dc supply 1 2 c26 150p rs1 bkw-m-r0003-5.0 c11 150p r5 4.7k c9 150p u3 stpm32 in1 11 ip1 10 vp1 8 en 7 int1 6 led2 5 led1 4 ckin/xtal1 3 xtal2 2 ckout/zcr 1 vcc 17 gndreg 16 vdda 15 gnda 14 vn1 9 vref1 12 gndref 13 gndd 18 ex ex vddd 19 syn 20 scs 21 scl 22 mosi 23 miso 24 r9 10k c25 10n c19 100n c22 100n scs vn1 vcc ip1 vcc txd rxd vp1 in1 vcc vcc vref1 1 int1 2 nc 3 led2 4 en/rst 5 led1 6 gnd 7 ckin 8 ckout/zcr 1 nc 2 mosi 3 gnd 4 miso 5 scs 6 scl 7 nc 8 syn 9 nc 10 vcc rs1 bkw 1 to assemble in case current sensor is current transformer to assemble in case current sensor is shunt gipg25032014di1550
revision history EVALSTPM32 4/5 docid026138 rev 1 2 revision history table 1. document revision history date revision changes 31-mar-2014 1 initial release.
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