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參數(shù)資料
| 型號(hào)： | MAX6689_07 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 7-Channel Precision Temperature Monitor |
| 中文描述： | 7通道高精度溫度監(jiān)測(cè) |
| 文件頁(yè)數(shù)： | 6/19頁(yè) |
| 文件大小： | 248K |
| 代理商： | MAX6689_07 |
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Detailed Description
The MAX6689 is a precision multichannel temperature
monitor that features one local and six remote tempera-
ture-sensing channels with a programmable alert
threshold for each temperature channel and a program-
mable overtemperature threshold for channels 1, 4, 5,
and 6 (see Figure 1). Communication with the MAX6689
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 MAX6689 starts the
conversion sequence by measuring the temperature on
channel 1, followed by 2, 3, local channel, 4, 5, and 6.
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 MAX6689
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 seven channels is consid-
erably greater in this mode than in the default mode.
Low-Power Standby Mode
Enter software standby mode by setting the STOP bit to
1 in the configuration 1 register. Enter hardware standby
by pulling
STBY
low. Software standby mode disables
the ADC and reduces the supply current to approxi-
mately 30μA. Hardware standby mode halts the ADC
clock, but the supply current is approximately 350μA.
During either software or hardware standby, data is
retained in memory. During hardware standby, the
SMBus interface is inactive. During software standby, the
SMBus interface is active and listening for commands.
The timeout is enabled if a start condition is recognized
on SMBus. Activity on the SMBus causes the supply cur-
rent to increase. If a standby command is received while
a conversion is in progress, the conversion cycle is inter-
7-Channel Precision Temperature Monitor
6
_______________________________________________________________________________________
PIN
NAME
FUNCTION
9
DXP5
Combined Current Source and A/D Positive Input for Channel 5 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to V
CC
if no
remote diode is used. Place a 2200pF capacitor between DXP5 and DXN5 for noise filtering.
Cathode Input for Channel 5 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN5.
10
DXN5
11
DXN6
Cathode Input for Channel 6 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN6.
12
DXP6
Combined Current Source and A/D Positive Input for Channel 6 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to V
CC
if no
remote diode is used. Place a 2200pF capacitor between DXP6 and DXN6 for noise filtering.
Active-Low Standby Input. Drive
STBY
logic-low to place the MAX6689 in standby mode, or logic-high
for operate mode. Temperature and threshold data are retained in standby mode.
No Connection. Must be connected to ground.
13
STBY
14
N.C.
15
OVERT
Overtemperature Active-Low, Open-Drain Output.
OVERT
asserts low when the temperature of
channels 1, 4, 5, and 6 exceeds the programmed threshold limit.
16
V
CC
Supply Voltage Input. Bypass to GND with a 0.1μF capacitor.
SMBus Alert (Interrupt), Active-Low, Open-Drain Output.
ALERT
asserts low when the temperature of
any channel exceeds the programmed
ALERT
threshold.
SMBus Serial-Data Input/Output. Connect to a pullup resistor.
SMBus Serial-Clock Input. Connect to a pullup resistor.
Ground
17
ALERT
18
19
20
SMBDATA
SMBCLK
GND
Pin Description (continued)
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