ST7LITEUS2 datasheet(14/136 Pages) STMICROELECTRONICS

14 / 136 page

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Pin description

ST7LITEUS2, ST7LITEUS5

14/136

Legend/abbreviations for Table 2

Type: I = input, O = output, S = supply

In/Output level: CT= CMOS 0.3 VDD /0.7 VDD with input trigger

Output level: HS = High sink (on N-buffer only)

Port and control configuration

●

Input: float = floating, wpu = weak pull-up, int = interrupt, ana = analog

●

Output: OD = open drain, PP = push-pull

The RESET configuration of each pin is shown in bold which is valid as long as the device is

in reset state.

Table 2.

Device pin description

no.

Pin name

Level

Port/control

Main

function

(after

reset)

Alternate function

Input

Output

1VDD

Main power supply

PA5/AIN4/CLKIN

CT HS

ei4

Port A5

Analog input 4 or External Clock

Input

3PA4/AIN3/MCO

CT HS

ei3

Port A4

Analog input 3 or main clock output

PA3/RESET (1)

Port A3

RESET(1)

PA2/AIN2/LTIC

CT HS

ei2

Port A2

Analog input 2 or Lite Timer Input

Capture

PA1/AIN1/

ICCCLK

CT HS

ei1

Port A1

Analog input 1 or In Circuit

Communication Clock

Caution: During normal operation

this pin must be pulled-up, internally

or externally (external pull-up of 10k

mandatory in noisy environment).

This is to avoid entering I2C mode

unexpectedly during a reset. In the

application, even if the pin is

configured as output, any reset will

put it back in pull-up

PA0/AIN0/ATPW

M/ICCDATA

CT HS

ei0

Port A0

Analog input 0 or Auto-Reload

Timer PWM or In Circuit

Communication Data

8VSS

Ground

After a reset, the multiplexed PA3/RESET pin will act as RESET. To configure this pin as output (Port A3), write 55h to

MUXCR0 and AAh to MUXCR1. For further details, please refer to Section 6.5 on page 37.

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