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sames

sames

SA9903B

http://www.sames.co.za

Figure 2: Pin connections: Package: DIP-20, SOIC-20

Part Number

SA9903BPA

SA9903BSA

Package

DIP-20

SOIC-20

ORDERING INFORMATION

PIN DESCRIPTION

Analog Ground. The supply voltage to this pin should be mid-way between

V

and V .

DD

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.

GND

V

DD

Designation

Description

PIN

20

8

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.

V

SS

14

Analog Input for Voltage. The current into the A/D converter should be set at

14µA

at nominal mains voltage. The voltage sense input saturates at an

RMS

input current of ±25µA peak.

19

IVP

Inputs for current sensor. The shunt resistor voltage from each channel is

converted to a current of 16µA

at rated conditions. The current sense input

RMS

saturates at an input current of ±25µA peak.

1, 2

IIN, IIP

This pin provides the connection for the reference current setting resistor.

A 24kW resistor connected to V sets the optimum operating condition.

SS

3

VREF

Manufacturers test pin, connect to V for normal operation.

SS

7

TEST

Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output)

10, 11

OSC1, OSC2

Serial clock in. This pin is used to stobe data in and out of the SA9903B

12

SCK

Serial data out. Data from the SA9903B is strobed out on this pin. DO is

only driven when CS is active.

13

DO

Voltage zero crossover. The FMO output generates a pulse (50% duty cycle)

on every rising edge of the mains voltage.

15

FMO

Serial data in. Data is only accepted during an active chip select (CS).

17

DI

Chip select. The CS pin is active high.

18

CS

Manufacturers Test Pins. (Leave unconnected)

4, 5, 6, 9, 16

TP4, TP5, TP6,

TP9, TP16

1

IIN

GND

IIP

IVP

FMO

CS

VSS

VREF

TP4

TP5

TP6

TEST

VDD

DI

TP16

DO

SCK

TP9

OSC2

OSC1

2

3

4

5

6

15

14

13

12

11

10

9

8

7

16

17

18

19

20

DR-01225