EMC1187 datasheet(28/47 Pages) MICROCHIP

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Triple Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1187

DATASHEET

6.1

Data Read Interlock

When any temperature channel high byte register is read, the corresponding low byte is copied into

an internal ‘shadow’ register. The user is free to read the low byte at any time and be guaranteed that

it will correspond to the previously read high byte. Regardless if the low byte is read or not, reading

from the same high byte register again will automatically refresh this stored low byte data.

6.2

Temperature Data Registers

As shown in Table 6.2, all temperatures are stored as an 11-bit value with the high byte representing

the integer value and the low byte representing the fractional value left justified to occupy the MSBits.

6.3

Status Register 02h

The Status Register reports general error conditions. To identify specific channels, refer to Section 6.9,

Section 6.16, Section 6.17, and Section 6.18. The individual Status Register bits are cleared when the

appropriate High Limit, Low Limit, or Therm Limit register has been read or cleared.

Bit 7 - BUSY - This bit indicates that the ADC is currently converting. This bit does not cause either

the ALERT or THERM pin to be asserted.

Table 6.2 Temperature Data Registers

ADDR

R/W

DEFAULT

00h

Internal Diode

High Byte

128

00h

29h

Internal Diode

Low Byte

0.5

0.25

0.125

00h

01h

External Diode

High Byte

128

00h

10h

External Diode

Low Byte

0.5

0.25

0.125

00h

23h

External Diode

2 High Byte

128

00h

24h

External Diode

2 Low Byte

0.5

0.25

0.125

00h

2Ah

External Diode

3 High Byte

128

00h

2Bh

External Diode

3 Low Byte

0.5

0.25

0.125

00h

Table 6.3 Status Register

ADDR

R/W

DEFAULT

02h

Status

BUSY

HIGH

LOW

FAULT

THERM

HWSD

00h

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