EM773

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Objective data sheet

Rev. 1 — 1 September 2010

7 of 45

NXP Semiconductors

EM773

Energy metering IC

[1]

Pin state at reset for default function: I = Input; O = Output; PU = internal pull-up enabled; IA = inactive, no pull-up/down enabled.

[2]

See Figure 24 for the reset pad configuration. RESET functionality is not available in Deep power-down mode. Use the WAKEUP pin to

reset the chip and wake up from Deep power-down mode.

[3]

5 V tolerant pad providing digital I/O functions with configurable pull-up/pull-down resistors and configurable hysteresis (see Figure 23).

[4]

[5]

5 V tolerant pad providing digital I/O functions with configurable pull-up/pull-down resistors, configurable hysteresis, and analog input.

[6]

When the system oscillator is not used, connect XTALIN and XTALOUT as follows: XTALIN can be left floating or can be grounded

(grounding is preferred to reduce susceptibility to noise). XTALOUT should be left floating.

PIO1_11

27

no

I/O

I;PU

PIO1_11 — General purpose digital input/output pin.

PIO2_0

I/O

Port 2 — Port 2 is a 12-bit I/O port with individual

direction and function controls for each bit. The

operation of port 2 pins depends on the function

selected through the IOCONFIG register block. Pins

PIO2_1 to PIO2_11 are not available.

PIO2_0/DTR

1[3]

no

I/O

I;PU

PIO2_0 — General purpose digital input/output pin.

O-

DTR — Data Terminal Ready output for UART.

PIO3_0 to PIO3_5

no

I/O

Port 3 — Port 3 is a 12-bit I/O port with individual

direction and function controls for each bit. The

operation of port 3 pins depends on the function

selected through the IOCONFIG register block. Pins

PIO3_0, PIO3_1, PIO3_3 and PIO3_6 to PIO3_11 are

not available.

PIO3_2

28[3]

no

I/O

I;PU

PIO3_2 — General purpose digital input/output pin.

PIO3_4

13[3]

no

I/O

I;PU

PIO3_4 — General purpose digital input/output pin.

PIO3_5

14[3]

no

I/O

I;PU

PIO3_5 — General purpose digital input/output pin.

6; 29

-

I

-

3.3 V supply voltage to the internal regulator, the

external rail, and the metrology engine.

XTALIN

4[6]

-

I

-

Input to the oscillator circuit and internal clock generator

circuits. Input voltage must not exceed 1.8 V.

XTALOUT

5[6]

-

O

-

Output from the oscillator amplifier.

33

-

-

-

Thermal pad. Connect to ground.

Table 2.

Symbol

Pin

Start

logic

input

Type

Reset

state

[1]

Description