MAX1617MEE+T【PDF 13/20 页】IC REMOTE/LOCAL TEMP SNSR 16QSOP

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Remote/Local Temperature Sensor

with SMBus Serial Interface

MAX1617

Maxim Integrated

To check for internal bus collisions, read the status

byte. If the least significant seven bits are ones, discard

the data and read the status byte again. The status bits

LHIGH, LLOW, RHIGH, and RLOW are refreshed on the

SMBus clock edge immediately following the stop con-

dition, so there is no danger of losing temperature-relat-

ed status data as a result of an internal bus collision.

The OPEN status bit (diode continuity fault) is only

refreshed at the beginning of a conversion, so OPEN

data is lost. The ALERT interrupt latch is independent of

the status byte register, so no false alerts are generat-

ed by an internal bus collision.

When auto-converting, if the THIGH and TLOW 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 (espe-

cially when converting at the fastest rate). In these cir-

cumstances, its best not to rely on the status bits to

indicate reversals 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 current in portable-equipment applications. The

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

MAX1617 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

available one total conversion time (125ms nominal,

156ms maximum) after initiating a conversion, whether

conversion 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. See Table 8.

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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