MAX1617AMEE+T【PDF 13/20 页】IC REMOTE/LOCAL TEMP SNSR 16QSOP

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sists. Note that the ALERT interrupt latch is not auto-

matically cleared when the status flag bit is cleared.

When auto-converting, if the T

HIGH

and T

LOW

limits are

close together, its possible for both high-temp and low-

temp status bits to be set, depending on the amount of

time between status read operations (especially when

converting at the fastest rate). In these circumstances,

its best not to rely on the status bits to indicate rever-

sals in long-term temperature changes and instead use

a current temperature reading to establish the trend

direction.

Conversion Rate Byte

The conversion rate register (Table 7) programs the time

interval between conversions in free-running auto-convert

mode. This variable rate control reduces the supply cur-

rent in portable-equipment applications. The conversion

rate bytes POR state is 02h (0.25Hz). The MAX1617A

looks only at the 3 LSB bits of this register, so the upper 5

bits are dont care bits, which should be set to zero. The

conversion rate tolerance is ?5% at any rate setting.

Valid A/D conversion results for both channels are avail-

able one total conversion time (125ms nominal, 156ms

maximum) after initiating a conversion, whether conver-

sion is initiated via the RUN/STOP bit, hardware STBY

pin, one-shot command, or initial power-up. Changing the

conversion rate can also affect the delay until new results

are available (Table 8).

Manufacturer and Device ID Codes

Two ROM registers provide manufacturer and device ID

codes (Table 4). Reading the manufacturer ID returns

4Dh, which is the ASCII code M (for Maxim). Reading

the device ID returns 01h, indicating a MAX1617A

device. If READ WORD 16-bit SMBus protocol is

employed (rather than the 8-bit READ BYTE), the least

significant byte contains the data and the most signifi-

cant byte contains 00h in both cases.

Slave Addresses

The MAX1617A appears to the SMBus as one device

having a common address for both ADC channels. The

device address can be set to one of nine different val-

ues by pin-strapping ADD0 and ADD1 so that more

than one MAX1617A can reside on the same bus with-

out address conflicts (Table 9).

Remote/Local Temperature Sensor

with SMBus Serial Interface

MAX1617A

Maxim Integrated

RUN/

STOP

POR

STATE

Standby mode control

bit. If high, the device

immediately stops con-

verting and enters stand-

by mode. If low, the

device converts in either

one-shot or timer mode.

Masks all ALERT inter-

rupts when high.

FUNCTION

RFU

Reserved for future use

MASK

7 (MSB)

BIT

NAME

Table 5. Configuration-Byte Bit

Assignments

Table 7. Conversion-Rate Control Byte

Table 6. Status-Byte Bit Assignments

*These flags stay high until cleared by POR, or until the status

byte register is read.

LHIGH*

A high indicates that the local high-

temperature alarm has activated.

A high indicates that the ADC is busy

converting.

FUNCTION

LLOW*

A high indicates that the local low-

temperature alarm has activated.

RHIGH*

A high indicates that the remote high-

temperature alarm has activated.

RLOW*

A high indicates that the remote low-

temperature alarm has activated.

OPEN*

A high indicates a remote-diode conti-

nuity (open-circuit) fault.

RFU

BUSY

(MSB)

Reserved for future use (returns 0)

RFU

(LSB)

Reserved for future use (returns 0)

BIT

NAME

0.125

01h

0.25

02h

0.5

03h

04h

05h

128

06h

0.0625

00h

225

07h

425

RFU

08h to

FFh

DATA

CONVERSION

RATE

(Hz)

AVERAGE SUPPLY

CURRENT

(礎 typ, at V

= 3.3V)

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