MAX6699EE34+【PDF 6/19 页】IC TEMP MONITOR 5CH 16-QSOP

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Detailed Description

The MAX6699 is a precision multichannel temperature

monitor that features one local and four remote temper-

ature-sensing channels with a programmable alert

threshold for each temperature channel and a program-

mable overtemperature threshold for channels 1 and 4

(see Figure 1). Communication with the MAX6699 is

achieved through the SMBus serial interface and a

dedicated alert pin. The alarm outputs, OVERT and

ALERT, assert if the software-programmed temperature

thresholds are exceeded. ALERT typically serves as an

interrupt, while OVERT can be connected to a fan, sys-

tem shutdown, or other thermal-management circuitry.

ADC Conversion Sequence

In the default conversion mode, the MAX6699 starts the

conversion sequence by measuring the temperature on

channel 1, followed by 2, 3, and local channel 4. The

conversion result for each active channel is stored in

the corresponding temperature data register.

In some systems, one of the remote thermal diodes may

be monitoring a location that experiences temperature

changes that occur much more rapidly than in the other

channels. If faster temperature changes must be moni-

tored in one of the temperature channels, the MAX6699

allows channel 1 to be monitored at a faster rate than

the other channels. In this mode (set by writing a 1 to bit

4 of the configuration 1 register), measurements of

channel 1 alternate with measurements of the other

channels. The sequence becomes channel 1, channel

2, channel 1, channel 3, channel 1, etc. Note that the

time required to measure all five channels is consider-

ably greater in this mode than in the default mode.

Low-Power Standby Mode

Standby mode reduces the supply current to less than

15礎 by disabling the internal ADC. Enter standby by

setting the STOP bit to 1 in the configuration 1 register.

During standby, data is retained in memory, and the

SMBus interface is active and listening for SMBus com-

mands. The timeout is enabled if a start condition is rec-

ognized on SMBus. Activity on the SMBus causes the

supply current to increase. If a standby command is

received while a conversion is in progress, the conver-

sion cycle is interrupted, and the temperature registers

are not updated. The previous data is not changed and

remains available.

5-Channel Precision Temperature Monitor

6 _______________________________________________________________________________________

NAME

FUNCTION

DXP4

Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode

of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to V

if no

remote diode is used. Place a 2200pF capacitor between DXP4 and DXN4 for noise filtering.

DXN4

Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 1 remote-diode-

connected transistor to DXN4.

9, 10

N.C._

No Connection. Must be connected to ground.

OVERT

Overtemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of

channels 1 and 4 exceeds the programmed threshold limit.

Supply Voltage Input. Bypass to GND with a 0.1礔 capacitor.

ALERT

SMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of

any channel exceeds the programmed ALERT threshold.

SMBDATA SMBus Serial-Data Input/Output. Connect to a pullup resistor.

SMBCLK

SMBus Serial-Clock Input. Connect to a pullup resistor.

GND

Ground

Pin Description (continued)

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