CS5460 datasheet(31/34 Pages) CIRRUS

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CS5460

DS279PP5

6. PIN DESCRIPTION

817

Crystal Out

XOUT

CPU Clock Output

CPUCLK

Positive Digital Supply

VD+

Digital Ground

DGND

Serial Clock Input

SCLK

Serial Data Output

SDO

Chip Select

No Connect

Differential Voltage Input

VIN+

Differential Voltage Input

VIN-

Voltage Reference Output

VREFOUT

Voltage Reference Input

VREFIN

XIN

Crystal In

SDI

Serial Data Input

EDIR

Energy Direction Indicator

EOUT

Energy Output

INT

Interrupt

RESET

Reset

No Connect

PFMON

Power Fail Monitor

IIN+

Differential Current Input

IIN-

Differential Current Input

VA+

Positive Analog Supply

VA-

Analog Ground

Clock Generator

Crystal Out

Crystal In

1,24

XOUT, XIN - A gate inside the chip is connected to these pins and can be used with a

crystal to provide the system clock for the device. Alternatively, an external (CMOS

compatible clock) can be supplied into XIN pin to provide the system clock for the device.

CPU Clock Output

CPUCLK - Output of on-chip oscillator which can drive one standard CMOS load.

Control Pins and Serial Data I/O

SCLK

Serial Clock Input - A clock signal on this pin determines the input and output rate of the

data for the SDI and SDO pins respectively. This input is a Schmitt trigger to allow for

slow rise time signals. The SCLK pin will recognize clocks only when CS is low.

SDO

Serial Data Output - SDO is the output pin of the serial data port. Its output will be in a

high impedance state when CS is high.

Chip Select - When active low, the port will recognize SCLK. An active high on this pins

puts the SDO pin in a high impedance state. CS should be changed when SCLK is low.

INT

Interrupt - When INT goes low it signals that an enabled event has occurred. INT is

cleared (logic 1) by writing the appropriate command to the CS5460.

EOUT

Energy Output - The energy output pin output a fixed-width pulse rate output with a rate

(programmable) proportional to energy.

EDIR

The energy direction indicator indicates if the measured energy is negative.

SDI

Energy Direction Indicator - Serial Data Input - SDI is the input pin of the serial data

port. Data will be input at a rate determined by SCLK.

Measurement and Reference Input

Differential

Voltage Inputs

9,10

VIN+, VIN- - Differential analog input pins for voltage channel.

Voltage

Reference Output

VREFOUT - The on-chip voltage reference is output from this pin. The voltage reference

has a nominal magnitude of 2.5 V and is reference to the VA- pin on the converter.

Voltage

Reference Input

VREFIN - The voltage input to this pin establishes the voltage reference for the on-chip

modulator.

CS5460 Datasheet(PDF) 31 Page - Cirrus Logic

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