SA9903BSA 查看數據表（PDF） - South African Micro Electronic Systems

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SA9903BSA

Single phase power/energy metering IC with SPI interface

South African Micro Electronic Systems 

SA9903B

sames

PIN DESCRIPTION

PIN

Designation

20

GND

8

VDD

14

VSS

19

IVP

1, 2

IIN, IIP

3

7

10, 11

VREF

TEST

OSC1, OSC2

Description

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

VDD and VSS.

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

14µARMS 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 16µARMS 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 VSS sets the optimum operating condition.

Manufacturers test pin, connect to VSS for normal operation.

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

12

SCK

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

13

DO

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

only driven when CS is active.

15

FMO

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

on every rising edge of the mains voltage.

17

DI

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

18

CS

Chip select. The CS pin is active high.

4, 5, 6, 9, 16

TP4, TP5, TP6,

TP9, TP16

Manufacturers Test Pins. (Leave unconnected)

IIN 1

IIP 2

VREF 3

TP4 4

TP5 5

TP6 6

TEST 7

VDD 8

TP9 9

OSC2 10

20 GND

19 IVP

18 CS

17 DI

16 TP16

15 FMO

14 VSS

13 DO

12 SCK

11 OSC1

DR-01225

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

ORDERING INFORMATION

Part Number

SA9903BPA

SA9903BSA

Package

DIP-20

SOIC-20

http://www.sames.co.za

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