CS5464 datasheet(6/46 Pages) CIRRUS

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CS5464

DS682PP1

2. PIN DESCRIPTION

Clock Generator

Crystal Out

Crystal In

1,28

XOUT, XIN - The output and input of an inverting amplifier. Oscillation occurs when connected to

a crystal, providing an on-chip system clock. Alternatively, an external clock can be supplied to

the 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

Serial Clock Input

SCLK - A Schmitt Trigger input pin. Clocks data from the SDI pin into the receive buffer and out of

the transmit buffer onto the SDO pin when CS is low.

Serial Data Output

SDO -Serial port data output pin.SDO is forced into a high impedance state when CS is high.

Chip Select

CS - Low, activates the serial port interface.

Mode Select

MODE - High, enables the “auto-boot” mode. The mode pin is pull-down by an internal resistor.

Energy Output

22, 25,

E3, E1, E2 - Active low pulses with an output frequency proportional to energy.

Reset

RESET - A Schmitt Trigger input pin. Low activates Reset, all internal registers (some of which

drive output pins) are set to their default states.

Interrupt

INT - Low, indicates that an enabled event has occurred.

Serial Data Input

SDI - Serial port data input pin. Data will be input at a rate determined by SCLK.

Analog Inputs/Outputs

Differential Voltage Inputs

9,10

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

Differential Current Inputs

19,20,

15,16

IIN+, IIN-, IIN2+, IIN2- - Differential analog input pins for the current channel.

Voltage Reference Output

VREFOUT - The on-chip voltage reference output. The voltage reference has a nominal magni-

tude of 2.5 V and is referenced to the AGND pin on the converter.

Voltage Reference Input

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

Power Supply Connections

Positive Digital Supply

VD+ - The positive digital supply.

Digital Ground

DGND - Digital Ground.

Positive Analog Supply

VA+ - The positive analog supply.

Analog Ground

AGND - Analog ground.

Power Fail Monitor

PFMON - The power fail monitor pin monitors the analog supply. If PFMON’s voltage threshold is

tripped, a Low-Supply Detect (LSD) event is set in the status register.

Test Connections

Factory Test

13,14

TEST1, TEST2 - Factory use only. Connect to AGND.

VREFIN

Voltage Reference Input

VREFOUT

Voltage Reference Output

VIN-

Differential Voltage Input

VIN+

Differential Voltage Input

MODE

Mode Select

Chip Select

SDO

Serial Data Ouput

SCLK

Serial Clock

DGND

Digital Ground

VD+

Positive Digital Supply

CPUCLK

CPU Clock Output

XOUT

Crystal Out

AGND

Analog Ground

VA+

Positive Analog Supply

IIN-

Differential Current Input

IIN+

Differential Current Input

PFMON

Power Fail Monitor

Energy Output 3

RESET

Reset

INT

Interrupt

Energy Output 1

SDI

Serial Data Input

XIN

Crystal In

Energy Output 2

TEST2

Factory Test

TEST1

Factory Test

IIN2-

Differential Current Input

IIN2+

Differential Current Input

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