CS5464 datasheet(6/46 Pages) CIRRUS

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CS5464

DS682F3

2. PIN DESCRIPTION

Clock Generator

Crystal Out

Crystal In

1,28

XOUT, XIN — Connect to an external quartz crystal. Alternatively, an external clock can be sup-

plied to the XIN pin to provide the system clock for the device.

CPU Clock Output

CPUCLK - Logic-level output from crystal oscillator. Can be used to clock an external CPU.

Control Pins and Serial Data I/O

Serial Clock

SCLK — Clocks serial data from the SDI pin and to the SDO pin when CS is low. SCLK is a

Schmitt-trigger input when MODE is low and a driven output when MODE is high.

Serial Data Output

SDO — Serial data output. Data is clocked out by SCLK.

Chip Select

CS — An input that enables the serial interface when MODE is low and a driven output when

MODE is high.

Mode Select

MODE — High selects external E2PROM, Low selects external microcontroller. MODE includes a

weak internal pull-down and therefore selects microcontroller mode if not connected.

Energy Outputs

22, 25,

E3, E1, E2 — Primarily active-low energy pulse outputs. These can be programmed to output

other conditions.

Reset

RESET — An active-low Schmitt-trigger input used to reset the chip.

Interrupt

INT — Active-low output, indicates that an enabled condition has occurred.

Serial Data Input

SDI — Serial data input. Data is clocked in by SCLK.

Analog Inputs/Outputs

Differential Voltage Inputs

9,10

VIN+, VIN- — Differential analog inputs for the voltage channel.

Differential Current Inputs

20,19,

16,15

IIN1+, IIN1-, IIN2+, IIN2- — Differential analog inputs for the current channels.

Power Fail Monitor

PFMON — Used to monitor the unregulated power supply via a resistive divider. If the PFMON

voltage drops below its low limit, the low-supply detect (LSD) bit is set in the Status register.

Voltage Reference Output

VREFOUT — The on-chip voltage reference output. Nominally 2.5 V, referenced to AGND.

Voltage Reference Input

VREFIN — The voltage reference input. Can be connected to VREFOUT or external 2.5 V refer-

ence.

Power 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.

Other Pins

Test1, Test2

13,14

NC — 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

IIN1-

Differential Current Input

IIN1+

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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