12

SMBus Thermal Sensor with External Diode Input

TCM1617

TCM1617-1

2/5/99

 2001 Microchip Technology Inc.

DS21485A

Status Register (Status), 8-Bits, Read Only:

Status Register (Status)

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

Busy

Flag1

Flag2

Flag3

Flag4

Flag5

Reserved

Bit

POR

Function

Operation*

State

D[7]

0

Signal A/D

1 = A/D busy,

converter is busy.

0 = A/D idle

D[6]

0

Interrupt flag for

1 = interrupt occurred,

INT_HLIM event

0 = none

D[5]

0

Interrupt flag for

1 = interrupt occurred,

INT_LLIM event

0 = none

D[4]

0

Interrupt flag for

1 = interrupt occurred,

EXT_HLIM event

0 = none

D[3]

0

Interrupt flag for

1 = interrupt occurred,

EXT_LLIM event

0 = none

D[2]

0

External diode

1 = external diode fault,

“fault” flag

0 = external diode OK

D[1:0]

0

Reserved –

N/A

Always

returns zero.

NOTE: All status bits are cleared after a read operation is performed on

STATUS. The EXT_TEMP register will read +127

°C if an external

diode “open” is detected.

Name

Description

POR

Read Write

State

INT_TEMP

Internal sensor

0000 0000b*



temperature

(2’s complement)

EXT_TEMP

External sensor

0000 0000b*



temperature

(2’s complement)

STATUS

STATUS register

0000 0000b



CONFIG

CONFIG register

0000 0000b



CONV_RATE A/D conversion

0000 0010b



rate register

INT_HLIM

Internal high

0111 1111b



limit

(2’s complement)

INT_LLIM

Internal low

1100 1001b



limit

(2’s complement)

EXT_HLIM

External high

0111 1111b



limit

(2’s complement)

EXT_LLIM

External low

1100 1001b



limit

(2’s complement)

MFR_ID

ASCII for letter “T” 0101 0100b



(Microchip)

MFR_REV

Serial device

**



revision#

NOTE: *The INT_TEMP and EXT_TEMP register immediately will be

updated by the A/D converter after POR. If STBY# is low at power-

up, INT_TEMP and EXT_TEMP will remain in POR state (0000

0000b). **MFR_REV will sequence 01h, 02h, 03h, etc. by mask-

ing changes.

The TCM1617’s register set is summarized below. All

registers are 8-bits wide.

Manufacturer’s Identification Register (MFR_ID)

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

MSB

XX

XX

X

X

LSB

Manufacturer’s Identification Register

(MFR_ID), 8-Bits, Read Only:

Manufacturer’s Revision Register (MFR_REV)

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

MSB

X

X

X

X

X

X

LSB

Manufacturer’s Revision Register

(MFR_REV), 8-Bits, Read Only:

Register Set Summary: