SA9103C
PIN DESCRIPTION
Pin
20
8
14
19
1
2
11
10
12
13
4
5
6
7
15
16
17
18
3
9
Designation
GND
V
DD
V
SS
IVP
IIN
IIP
OSC1
OSC2
SOUT
SIN
CPON
CPOP
CPIN
CPIP
CIP
CIN
COP
CON
VREF
TP9
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Serial Interface Out
Serial Interface In
Connections for outer loop capacitors of
A/D converter (Voltage)
Connections for inner loop capacitors of
A/D converter (Voltage)
Connections for inner loop capacitors of
A/D converter (Current)
Connections for outer loop capacitors of
A/D converter (Current)
Connection for current setting resistor
Test Pin. Must be connected to V
SS
Description
Ground
Positive Supply Voltage
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
FUNCTIONAL DESCRIPTION
The SA9103C is a CMOS mixed signal Analog/Digital integrated circuit, which performs
power/energy calculations across a power range of 1000:1, to an overall accurancy of
better than Class 1.
The integrated circuit includes all the required functions for 1-phase power and energy
measurement, such as two oversampling A/D converters for the voltage and current
sense inputs, power calculation and energy integration. Internal offsets are eliminated
through the use of cancellation procedures. The SA9103C integrates the measured
active and reactive power consumption into 22 bit integrators, which are accessable via
a serial port having a RS232 protocol. Two additional on-chip registers exist: one register
contains the mains frequency information; and the other the voltage information.
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