Rev. 1.1 10/12
Copyright © 2012 by Silicon Laboratories
Si890x-PWR-EVB
S i 8 9 0 x - P W R - E V B
S i 8 9 0
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I T
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U I D E
1. Introduction
The Si890x are isolated ADCs suitable for low-frequency analog data acquisition applications. These devices
integrate an isolated 10-bit SAR ADC with I
2
C, UART, or SPI serial communication ports. Isolation ratings of 2.5 or
5 kV are available. See the Si8900 data sheet for details.
2. Kit Contents
The Si890xPWR-EVB Evaluation kit contains the following items:
Si890xPWR-EVB evaluation module containing:
High voltage 110 V/220 V ac line current and voltage measurement circuit with 3.3 Vpp analog output signals
Si8900 Isolated 10-bit ADC with UART serial port
Si8901 Isolated 10-bit ADC with I
2
C serial port
Si8902 Isolated 10-bit ADC with SPI serial port
C8051F007 mixed-signal MCU master controller
AC line-side bias supply
2.1. Hardware Overview
The Si890xPWR-EVB (Figure 1) demonstrates 50/60 Hz ac line voltage and current measurements. This EVB is
housed in a plastic case with recessed connectors to protect against user electrical shock. The Si890x accepts a
110 or 220 Vac input and supports load currents up to 10 A (max). The on-board line side circuit interface
measures ac voltage and current, which is then digitized by the Si890x on-chip 10-bit ADC. The resulting converted
data is then transmitted through the output side isolated serial port to the on-board master processor (C8051F007
MCU). The C8051F007 converts the serial data back to analog format where it is available to the user at the low-
voltage side of the evaluation module.
Key features for this EVB include the following:
EVB module measures ac line voltage (110 Vac or 220 Vac at 50/60 Hz) and ac line current (10 A max)
10-bit ADC with three input channels and selectable, isolated serial ports: UART (Si8900) or I
2
C (Si8901) or SPI
(Si8902)
High common mode transient immunity (CMTI): 35 kV/µs (min), 50 kV/µs (typ)
Industrial temperature operating range (–40 to +85
°
C)
60-year isolation barrier life at rated working voltage
Safety certified (pending)
CSA component notice 5A approval
IEC 60950, 61010, 60601
VDE/IEC 60747-5-2
UL1577 recognized: (Up to 5 kVrms for 1 minute)
Danger! High Voltage: Read instructions carefully. Do not operate this evaluation board unless it is
housed in its plastic case and secured by the four screws.
