EMC1702 datasheet(32/57 Pages) SMSC

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High-Side Current-Sense and Dual 1°C Temperature Monitor

Datasheet

Revision 1.2 (09-27-10)

SMSC EMC1702

DATASHEET

5.1

Data Read Interlock

When any measurement channel high byte register is read (temperature or VSOURCE or VSENSE), 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.

5.2

Block Mode Support

All of the status and temperature data may be retrieved with a block read of 8 bytes starting at register

address 34h.

All of the voltage measurement, current sense data, and power information may be retrieved with a

block read of 6 bytes starting at register address 54h.

5.3

Temperature Data Registers

66h

R/W

Sense Voltage Vcrit

Limit

Stores the critical limit for VSENSE

7Fh

Page 50

68h

R/W

Source Voltage Vcrit

Limit

Stores the critical limit for the

voltage on the source side of

RSENSE

FFh

Page 50

69h

R/W

Sense Vcrit

Hysteresis

Stores the hysteresis for the

VSENSE Vcrit limit

0Ah

Page 50

6Ah

R/W

Source Voltage Vcrit

Hysteresis

Stores the hysteresis for the

source voltage Vcrit limits

0Ah

Page 50

FCh

Product Features

Stores information about which pin

controlled product features are set

00h

Page 51

FDh

Product ID

Stores a fixed value that identifies

each product

39h

Page 51

FEh

SMSC ID

Stores a fixed value that

represents SMSC

5Dh

Page 52

FFh

Revision

Stores a fixed value that

represents the revision number

82h

Page 52

Table 5.2 Temperature Data Registers

ADDR

R/W

DEFAULT

00h

Internal Diode

High Byte

Sign

00h

38h

29h

Internal Diode

Low Byte

0.5

0.25

0.125

00h

39h

Table 5.1 Register Set in Hexadecimal Order (continued)

ADDRESS

R/W

FUNCTION

DEFAULT

VALUE

PAGE

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