MAX1617AMEE+T【PDF 12/20 页】IC REMOTE/LOCAL TEMP SNSR 16QSOP

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The Alert Response can activate several different slave

devices simultaneously, similar to the I

C general call. If

more than one slave attempts to respond, bus arbitra-

tion rules apply, and the device with the lower address

code wins. The losing device does not generate an

acknowledge and continues to hold the ALERT line low

until serviced (implies that the host interrupt input is

level-sensitive). Successful reading of the alert

response address clears the interrupt latch.

Command Byte Functions

The 8-bit command byte register (Table 4) is the master

index that points to the various other registers within the

MAX1617A. The registers POR state is 0000 0000, so

that a Receive Byte transmission (a protocol that lacks

the command byte) that occurs immediately after POR

returns the current local temperature data.

The one-shot command immediately forces a new conver-

sion cycle to begin. In software standby mode

(RUN/STOP bit = high), a new conversion is begun, after

which the device returns to standby mode. If a conversion

is in progress when a one-shot command is received, the

command is ignored. If a one-shot command is received

in auto-convert mode (RUN/STOP bit = low) between con-

versions, a new conversion begins, the conversion rate

timer is reset, and the next automatic conversion takes

place after a full delay elapses.

Configuration Byte Functions

The configuration byte register (Table 5) is used to

mask (disable) interrupts and to put the device in soft-

ware standby mode. The lower six bits are internally set

to (XX1111), making them dont care bits. Write zeros

to these bits. This registers contents can be read back

over the serial interface.

Status Byte Functions

The status byte register (Table 6) indicates which (if

any) temperature thresholds have been exceeded. This

byte also indicates whether or not the ADC is convert-

ing and whether there is an open circuit in the remote

diode DXPDXN path. After POR, the normal state of all

the flag bits is zero, assuming none of the alarm condi-

tions are present. The status byte is cleared by any

successful read of the status byte, unless the fault per-

Remote/Local Temperature Sensor

with SMBus Serial Interface

MAX1617A

Maxim Integrated

Table 4. Command-Byte Bit Assignments

*If the device is in hardware standby mode at POR, both temperature registers read 0?/SPAN>C.

Read remote temperature: returns latest temperature

RRTE

01h

00h

COMMAND

0000 0000*

POR STATE

Read configuration byte

RCL

03h

02h

0000 0000

N/A

Read status byte (flags, busy signal)

RSL

Read local T

HIGH

limit

RLHN

05h

Read local temperature: returns latest temperature

RLTS

04h

0111 1111

0000 0010

Read remote T

HIGH

limit

RRHI

07h

06h

0111 1111

1100 1001

Read local T

LOW

limit

RLLI

Read conversion rate byte

RCRA

Write configuration byte

WCA

09h

08h

N/A

1100 1001

FUNCTION

Write local T

HIGH

limit

WLHO

0Bh

0Ah

N/A

Write conversion rate byte

WCRW

Write remote T

HIGH

limit

WRHA

0Dh

Read remote T

LOW

limit

RRLS

0Ch

N/A

One-shot command (use send-byte format)

OSHT

0Fh

0Eh

N/A

Write remote T

LOW

limit

WRLN

Write local T

LOW

limit

WLLM

Write software POR

SPOR

FCh

N/A

Read device ID code

DEVID

FFh

FEh

00000001

0100 1101

Read manufacturer ID code

MFGID

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