SMD1102 datasheet(4/14 Pages) SUMMIT

4 / 14 page

SMD1102 / 1103 / 1113

2033 8.1 10/04/01

SUMMIT MICROELECTRONICS, Inc.

PIN DESCRIPTIONS

Serial Clock (SCL)

The SCL input is used to clock data into and out of the

device. In the WRITE mode data must remain stable while

SCL is HIGH. In the READ mode data is clocked out on

the falling edge of SCL.

Serial Data (SDA)

The SDA pin is a bidirectional pin used to transfer data into

and out of the device. Data may change only when SCL

is LOW, except during START and STOP conditions. It is

an open-drain output and may be wire-ORed with any

number of open-drain or open-collector outputs.

SMBALERT#

This interrupt output pin signals the host when an out-of-

limit condition is detected by one of the EEPROM limit

registers. The SMBALERT open-drain output is active low.

REFIN

Voltage reference input for 10-Bit A/D converter. This

signal is only on the SMD1102 and SMD1113.

AIN0, AIN1, AIN2

Multiplexer input pins for channels 0, 1, and 2, respec-

tively.

AIN2 is only available on the SMD1103 and

SMD1113. These pins may be left unconnected if they are

not used.

However, the Alert Regions must be set

accordingly (see the section "Alert Conditions").

A0, A1, A2

The address inputs are only available on the SMD1113.

Multiple SMD1113s can be used on a single bus by setting

different device addresses.

A2 has a 50k

Ω pull-up

resistor, and A1 and A0 have 50k

Ω pull-down resistors.

Do not set the address to all zeroes because it would

cause a conflict with the SMB Alert Response.

CE#

Chip Enable/disable input must be held low to enable I2C

communications. It has a 50k

Ω pull-down resistor and is

only available on the SMD1113.

VDD

Power supply input.

GND

Power supply return.

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