MAX1617

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11

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

Flag6

Re-

served

Bit(s)

POR

State

Function

Operation*

D[7]

0

Signal A/D

converter is busy.

1 = A/D busy,

0 = A/D idle

D[6]

0

Interrupt flag for

INT_HLIM event

1 = interrupt occurred,

0 = none

D[5]

0

Interrupt flag for

INT_LLIM event

1 = interrupt occurred,

0 = none

D[4]

0

Interrupt flag for

EXT_HLIM event

1 = interrupt occurred,

0 = none

D[3]

0

Interrupt flag for

EXT_LLIM event

1 = interrupt occurred,

0 = none

D[2]

0

External diode

“fault” flag

1 = external diode fault

0 = external diode OK

D[1:0]

0

Reserved —

Always returns

zero.

N/A

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.

Manufacturer’s Identification Register (MFR_ID),

8–Bits, Read Only:

Manufacturer’s Identification Register (MFR_ID)

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:

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

Register Set Summary:

The MAX1617’s register set is summarized in the following table. All registers are 8–bits wide.

Name

Description

POR State

Read

Write

INT_TEMP

Internal sensor temperature (2’s complement)

0000 0000b*

√

EXT_TEMP

External sensor temperature (2’s complement)

0000 0000b*

√

STATUS

STATUS register

0000 0000b

√

CONFIG

CONFIG register

0000 0000b

√

√

CONV_RATE

A/D conversion rate register

0000 0010b

√

√

INT_HLIM

Internal high limit (2’s complement)

0111 1111b

√

√

INT_LLIM

Internal low limit (2’s complement)

1100 1001b

√

√

EXT_HLIM

External high limit (2’s complement)

0111 1111b

√

√

EXT_LLIM

External low limit (2’s complement)

1100 1001b

√

√

MFR_ID

ASCII for letter “T”

0101 0100b

√

MFR_REV

Serial device revision #

**

√

CRITICAL

CRITICAL limit (2’s complement)

N/A

√***

*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 changes.

***CRITICAL only can be written via the CRIT[1:0] pins. It cannot be accessed through the SMBus port.