ADE75 datasheet(20/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 20 of 148

PIN DESCRIPTIONS

Table 10. Pin Function Descriptions

Pin No.

Mnemonic

Description

COM3/ FP27

Common output, COM3 is used for LCD backplane / LCD segment outputs 27

COM2/ FP28

Common output, COM2 is used for LCD backplane / LCD segment outputs 28

COM1

Common output, COM1 is used for LCD backplanes

COM0

Common output, COM0 is used for LCD backplanes

P1.2/FP25

General-purpose digital I/O / LCD segment outputs 25

P1.3/T2EX/FP24

General-purpose digital I/O / Timer 2 control input / LCD segment outputs 24

P1.4/T2/FP23

General-purpose digital I/O / Timer 2 input / LCD segment outputs 23

P1.5/FP22

General-purpose digital I/O / LCD segment outputs 22

P1.6/FP21

General-purpose digital I/O / LCD segment outputs 21

P1.7/FP20

General-purpose digital I/O / LCD segment outputs 20

P0.1/FP19

General-purpose digital I/O / LCD segment outputs 19

P2.0/FP18

General-purpose digital I/O / LCD segment outputs 18

P2.1/FP17

General-purpose digital I/O / LCD segment outputs 17

P2.2/FP16

General-purpose digital I/O / LCD segment outputs 16

LCDVC

Output port for LCD levels. This pin should be decoupled with a 470nF capacitor.

LCDVP2

This pin is an analog output. A capacitor of 470nF should be connected between this pin and LCDVP1

for internal LCD charge pump device.

17, 18

LCDVB, LCDVA

Output ports for LCD levels. These pins should be decoupled with a 470nF capacitor.

LCDVP1

This pin is an analog output. A capacitor of 470nF should be connected between this pin and LCDVP2for

internal LCD charge pump device.

35-20

FP0-15

LCD segment outputs 0-15

P1.1/TxD

General-purpose digital I/O / Transmitter Data Output 1 (Asynchronous)

P1.0/RxD

General-purpose digital I/O / Receiver Data Input 1 (Asynchronous)

P0.7 /SS/T1

General-purpose digital I/O / Slave select when SPI is in Slave mode / Timer 1 input

P0.6/SCLK/T0

General-purpose digital I/O / Clock output for I2C or SPI port / Timer 0 input

P0.5/MISO

General-purpose digital I/O / Data In for SPI port

P0.4/MOSI/SDATA

General-purpose digital I/O / Data Line I2C compatible or Data Out for SPI port

P0.3/CF2

General-purpose digital I/O / Calibration Frequency Logic Output.

The CF2 logic output gives instantaneous active, reactive or apparent power information.

P0.2/CF1/RTCCAL

General-purpose digital I/O / Calibration Frequency Logic Output/ RTC calibration output..

The CF1 logic output gives instantaneous active, reactive or apparent power information.

The RTCCAL output provides a way to calibrate the RTC to within ±2ppm, or 0.17s/day –see the RTC

Calibration section.

SDEN/P2.3

This pin is used to enable serial download mode when pulled low through a resistor on power-up or

reset. On reset this pin will momentarily become an input and the status of the pin is sampled. If there is

no pulldown resistor in place, the pin will go momentarilly high and then user code will execute. If a

pull-down resistor is in place, the embedded serial download/debug kernel will execute and this pin

remains low during internal program execution. This pin can also be used as a general purpose output.

BCTRL/INT1/ P0.0

Digital Input for Battery control. This logic input connects VDD or VBAT to VSW internally when set to logic

High or Low respectively. When left open, the connection between VDD or VBAT to VSW is selected

internally / External Interrupt input / General-purpose digital I/O

XTAL2

A crystal can be connected across this pin andXTAL1 as described above to provide a clock source for

the ADE75xx/ADE71xx.The XTAL2 pin can drive one CMOS load when an external clock is supplied at

XTAL1 or by the gate oscillator circuit.

XTAL1

An external clock can be provided at this logic input. Alternatively, a parallel resonant AT crystal can be

connected across XTAL1 and XTAL2 to provide a clock source for the ADE75xx/ADE71xx.The clock

frequency for specified operation is 32.768 kHz.

INT0

General-purpose digital I/O / Interrupt input

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