SA9903B
PIN DESCRIPTION
PIN
20
8
Designation
GND
V
DD
Description
sames
Analog Ground. The supply voltage to this pin should be mid-way between
V
DD
and V
SS
.
Positive Supply voltage. The voltage to this pin is typically +2.5V if a shunt
resistor is used for current sensing or in the case of a current transformer a
+5V supply can be applied.
Negative Supply Voltage. The voltage to this pin is typically -2.5V if a shunt
resistor is used for current sensing or in the case of a current transformer a
0V supply can be applied.
Analog Input for Voltage. The current into the A/D converter should be set at
14µA
RMS
at nominal mains voltage. The voltage sense input saturates at an
input current of ±25µA peak.
Inputs for current sensor. The shunt resistor voltage from each channel is
converted to a current of 16µA
RMS
at rated conditions. The current sense input
saturates at an input current of ±25µA peak.
This pin provides the connection for the reference current setting resistor.
A 24kW resistor connected to V
SS
sets the optimum operating condition.
Manufacturers test pin, connect to V
SS
for normal operation.
Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output)
Serial clock in. This pin is used to stobe data in and out of the SA9903B
Serial data out. Data from the SA9903B is strobed out on this pin. DO is
only driven when CS is active.
Voltage zero crossover. The FMO output generates a pulse (50% duty cycle)
on every rising edge of the mains voltage.
Serial data in. Data is only accepted during an active chip select (CS).
Chip select. The CS pin is active high.
Manufacturers Test Pins. (Leave unconnected)
14
V
SS
19
IVP
1, 2
IIN, IIP
3
7
10, 11
12
13
15
17
18
4, 5, 6, 9, 16
VREF
TEST
OSC1, OSC2
SCK
DO
FMO
DI
CS
TP4, TP5, TP6,
TP9, TP16
IIN
IIP
VREF
TP4
TP5
TP6
TEST
VDD
TP9
OSC2
1
2
3
4
5
6
7
8
9
10
DR-01225
20
19
GND
IVP
ORDERING INFORMATION
Part Number
SA9903BPA
SA9903BSA
Package
DIP-20
SOIC-20
18 CS
17 DI
16 TP16
15 FMO
14 VSS
13 DO
12
SCK
11 OSC1
Figure 2: Pin connections: Package: DIP-20, SOIC-20
3/12
SAMES [ SAMES ]
