SA9903B
PIN DESCRIPTION
Designation
Pin No.
Description
Analog Ground. This is the reference pin for the current and voltage signal sensing
AGND
20
8
networks. The supply voltage to this pin should be mid-way between VDD and VSS
.
Positive Supply Voltage. The voltage to this pin should be +2.5V ± 10% with respect to
AGND.
VDD
VSS
Negative Supply Voltage. The voltage to this pin should be -2.5V ± 10% with respect to
AGND.
14
19
2, 1
3
Analog Input for Voltage. The nominal current into the voltage sense input IVP should be
set at 14µARMS. The voltage sense input saturates at an input current of ±25µA peak.
IVP
Analog Inputs for Current. The maximum current into the current sense inputs IIP/IIN should
be set at 16µARMS. The current sense inputs saturate at an input current of ±25µA peak.
IIP, IIN
VREF
This pin provides the connection for the reference current setting resistor. A 24k resistor
connected to VSS sets the optimum operating conditions.
OSC1, OSC2
SCK
11, 10
12
Connection for crystal
SPI Serial Clock input. This pin is used to strobe data in and out of the SA9903B
SPI Chip Select input. This input pin enables the SPI interface. It is active high.
CS
18
SPI Data In input. Input data is accepted on this pin at the rising clock edge on SCK when
CS is active.
DI
17
13
SPI Data Out output. Output data is strobed out on this pin at the rising clock edge on SCK
when CS is active. DO is not driven when CS is inactive.
DO
Voltage zero crossover. The F50 output generates a 50% duty cycle pulse on every rising
edge of the mains voltage.
FMO
15
7
TEST
NC
Manufacturers test pin, connect this pin to VSS for normal operation
4, 5, 6, 9, 16 No connection, leave unconnected
ORDERING INFORMATION
1
2
20
19
18
17
16
15
14
13
12
11
IIN
IIP
AGND
IVP
Part Number
Package
SA9903BSAR
SOIC20 (RoHS compliant)
3
VREF
NC
CS
4
DI
5
NC
NC
6
NC
FMO
VSS
DO
7
TEST
VDD
NC
8
9
SCK
OSC1
10
OSC2
Figure 3: Pin connections
SPEC-0051 (REV. 5)
29-09-2017
4/17
SAMES [ SAMES ]
