EMC1428 datasheet(14/53 Pages) MICROCHIP

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1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

Data Sheet

DS20005275A-page 14

 2014 Microchip Technology Inc.

The EMC1428 will respond to the ARA in the following way:

1. Send Slave Address and verify that full slave address was sent (i.e. the SMBus communication

from the device was not prematurely stopped due to a bus contention event).

2. Set the MASK bit to clear the ALERT pin.

APPLICATION NOTE: The ARA does not clear the Status Register and if the MASK bit is cleared prior to the Status

3.7

SMBus Address

The EMC1428-1 devices respond to the 7-bit slave address 1001_100xb.

The EMC1428-6 will respond to the 7-bit slave address 1001_101xb.

The EMC1428-7 slave address is determined at power up via the pull-up resistor on the SYS_SHDN

pin as shown in Table 3.7.

Note: Other addresses are available. Contact Microchip for more information.

3.8

SMBus Timeout

The EMC1428 support SMBus Timeout. If the clock line is held low for longer than 30ms, the device

will reset its SMBus protocol. This function can be enabled by setting the TIMEOUT bit in the

Consecutive Alert Register (see Section 5.14).

Table 3.6 Alert Response Address Protocol

START

ALERT

RESPONSE

ADDRESS

ACK

DEVICE

ADDRESS

NACK

STOP

1 -> 0

0001_100

1001_1000

1 -> 0

Table 3.7 Address Select Decode on SYS_SHDN Pin

PULL UP

RESISTOR

SMBUS

ADDRESS

4.7k Ohm ±5%

1001_000xb

6.8k Ohm ±5%

1001_001xb

10k Ohm ±5%

1001_010xb

15k Ohm ±5%

1001_011xb

22k Ohm ±5%

1001_100xb

33k Ohm ±5%

1001_101xb

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