SA9904A 查看數據表（PDF） - South African Micro Electronic Systems

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SA9904A

Three Phase Power / Energy IC with SPI Interface

South African Micro Electronic Systems 

SA9904A

Reference Voltage (VREF)

The VREF pin is the reference for the bias resistor. With a bias

resistor of 47kW optimum conditions are set.

Serial Clock (SCK)

The SCK pin is used to synchronize data interchange between

the micro controller and the SA9904A. The clock signal on this

pin is generated by the micro controller and determines the

data transfer rate of the DO and DI pins.

Serial Data In (DI)

The DI pin is the serial data input pin for the SA9904A. Data will

be input at a rate determined by the Serial Clock (SCK). Data

will be accepted only during an active chip select (CS).

Chip Select (CS)

The CS input is used to address the SA9904A. An active high

on this pin enables the SA9904A to initiate data exchange.

sames

OUTPUT SIGNALS

SERIAL DATA OUT (DO)

The DO pin is the serial data output pin for the SA9904A. The

Serial Clock (SCK) determines the data output rate. Data is

only transferred during on active chip select (CS). This output

is tri-state when CS is low.

MAINS VOLTAGE SENSE ZERO CROSSOVER (F150)

The F150 output generates a signal, which follows the mains

voltage zero crossings, see figure 4. The micro controller may

use the F150 to extract mains timing.

ELECTROSTATIC DISCHARGE (ESD) PROTECTION

The SA9904A Integrated Circuit's inputs/outputs are protected

against ESD.

POWER CONSUMPTION

The power consumption rating of the SA9904A integrated

circuit is less than 60mW.

Phase 1

Phase 2

Phase 3

FM150

dr-01464

1mS

+5V

0V (Vss)

Figure 4: Mains voltage zero crossover pin FMO

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