for further information contact your local stmicroelectronics sales office. march 2014 docid026140 rev 1 1/5 EVALSTPM34 dual-phase energy metering evaluation board with 2 current transformers based on the stpm34 data brief features ? 0.2% accuracy dual or split-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 stpm34 evaluation board is a class 0.2, dual-phase meter with 2 cts 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 EVALSTPM34 2/5 docid026140 rev 1 1 schematic diagrams figure 1. rs232/uart circuit schematic j3 rs-232 enable 1 2 j2 uart i/o 1 2 3 4 j1 rs-232 db9 1 6 2 7 3 8 4 9 5 sw1 sw dip-3 c6 100n c1 100n c4 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 c2 100n r1 10k c7 100n u2 si8621 vdd1 1 gnd1 4 gnd2 5 vdd2 8 a1-in 2 a2-out 3 b2-in 6 b1-out 7 c5 100n c3 100n vcc scs rxd txd vcc 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 gipg25032014di1530
docid026140 rev 1 3/5 EVALSTPM34 schematic diagrams 5 figure 2. metrology circuit schematic c8 100n r2 22k c27 100n y1 16mhz c10 10n dl2 led2 r6 4.7k l7 1500ohm c15 150p r9 10k c31 150p l5 1500ohm c11 150p c24 22n c20 4.7u dl1 led1 r5 4.7k r26 470r j8 n 1 c21 150p c29 100n j5 digital i/o 2 4 6 8 1 3 5 7 r8 10k l4 1500ohm c22 100n l3 1500ohm l1 1500ohm rs1 bkw-m-r0003-5.0 r13 270k r16 6r t1 vac 4626-x002 j11 vref 1-2 1 2 j10 l2 1 c30 1u r10 10k l2 1500ohm c16 15p c25 10n c32 100n r24 270k r3 100r j4 enable/rst 1 1 2 2 3 3 j6 spi 1 2 3 4 5 6 7 8 9 10 j9 l1 1 t2 vac 4626-x002 c26 150p u3 stpm33/34 in2 13 in1 12 ip1 11 vp1 9 en 8 int2 7 int1 6 led2 5 led1 4 ckin/xtal1 3 xtal2 2 ckout/zcr 1 vcc 23 gndreg 22 vdda 21 gnda 20 vn1 10 ip2 14 vn2/nc 15 vp2/nc 16 vref1 17 gndref 18 vref2 19 nc 24 ex ex gndd-nc 25 gndd 26 vddd 27 syn 28 scs 29 scl 30 mosi 31 miso 32 c19 100n j7 dc supply 1 2 c14 150p l6 1500ohm r11 100r c17 15p c33 10n c13 150p c23 100u 10v r19 0r c18 150p r23 270k r18 1k c12 150p r12 270k r15 470r r17 1k r4 1m r25 270k r14 270k r7 10k r21 6r r20 1k c28 150p c9 150p c34 22n r22 1k vcc vref2 vref1 ip2 in2 vp1 vn1 vn2 vp2 vcc vref1 vref2 in1 ip1 vcc line2 rxd txd vcc scs 1 int1 2 int2 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 do not assemble in case stpm33 rs bk k s to assemble in case current sensor is shunt to assemble in case current sensor is current transformer gipg25032014di1535
revision history EVALSTPM34 4/5 docid026140 rev 1 2 revision history table 1. document revision history date revision changes 31-mar-2014 1 initial release.
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