MAX1617 データシートの表示（PDF） - ON Semiconductor

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MAX1617

SMBus Temperature Sensor with Internal and External Diode Input

ON Semiconductor 

MAX1617

PIN DESCRIPTION

Pin No.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6, 10

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 7, 8

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 11

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 12

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 14

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 15

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1, 5, 9, 13, 16

Symbol

VDD

D+

D–

ADD[1:0]

GND

ALERT

SDA

SCL

STBY

NC

Type

Power

Bi–Directional

Bi–Directional

Input

Power

Output

Bi–Directional

Input

Input

–

Description

Power Supply Input

Current Source and A/D Positive Input

Current Sink and A/D Negative Input

Address Select Pins (See Address Decode Table)

System Ground

SMBus Interrupt (SMBALERT) or Comparator Output

SMBus Serial Data

SMBus Serial Clock

Standby Enable

Not Connected

PIN DESCRIPTION

SCL

(NOTE: A pull–up resistor is necessary on ALERT since

Input. SMBus serial clock. Clocks data into and out of the it is an open–drain output. Current sourced from the pull–up

MAX1617.

SDA

resistor causes power dissipation and may cause internal

heating of the MAX1617. To avoid affecting the accuracy of

internal temperature readings, the pull–up resistors should

Bi–directional. Serial data is transferred on the SMBus in be made as large as possible.)

both directions using this pin.

STBY

ADD1, ADD0

Input. The activation of Standby mode may be achieved

Inputs. Sets the 7–bit SMBus address. These pins are using either the STBY pin or the CHIP STOP bit (CONFIG

“tri–state,” and the SMBus addresses are specified in the register). If STBY is pulled low, the MAX1617

Address Decode Table below.

unconditionally enters its low–power Standby mode. The

(NOTE: The tri–state scheme allows up to nine temperature–to–digital conversion process is halted, but

MAX1617s on a single bus. A match between the ALERT remains functional. The MAX1617’s bus interface

MAX1617’s address and the address specified in the serial remains active, and all registers may be read from and

bit stream must be made to initiate communication. Many written to normally. The INT_TEMP and EXT_TEMP

SMBus–compatible devices with other addresses may share registers will contain whatever data was valid at the time of

the same 2–wire bus. These pins are only active at power–on Standby. (Transitions on SDA or SCL due to external bus

reset, and will latch into the appropriate states.

activity may increase the Standby power consumption.)

ALERT

Output, Open Collector, Active Low. The ALERT output

corresponds to the general SMBALERT signal and indicates

an interrupt event. The MAX1617 will respond to the

standard SMBus Alert Response Address when ALERT is

asserted. Normally, the ALERT output will be asserted when

any of the following occurs:

INT_TEMP equal to or exceeds INT_HLIM

INT_TEMP falls below INT_LLIM

EXT_TEMP equal to or exceeds EXT_HLIM

EXT_TEMP falls below EXT_LLIM

External Diode “Open”

The operation of the ALERT output is controlled by the

MASK1 bit in the CONFIG register. If the MASK1 bit is set

to “1,” no interrupts will be generated on ALERT. The

ALERT output is cleared and re–armed by the Alert

Response Address (ARA). This output may be

WIRE–ORed with similar outputs from other SMBus

devices. If the alarm condition persists after the ARA, the

ALERT output will be immediately re–asserted.

D+

Bi–directional. this pin connects to the anode of the

external diode and is the positive A/D input. Current is

injected into the external diode from the MAX1617, and the

temperature proportional VBE is measured and converted to

digital temperature data.

D–

Bi–directional. This pin connects to the cathode of the

external diode. Current is sunk from the external diode into

the MAX1617 through this pin. It also is the negative input

terminal to the MAX1617’s A/D converter. This node is kept

at approximately 0.7 V above GROUND.

VDD

Input. Power supply input. See electrical specifications.

GND

Input. Ground return for all MAX1617 functions.

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