參數(shù)資料
型號(hào)： MAX1669
廠商： Maxim Integrated Products, Inc.
元件分類： 溫度/濕度傳感器
英文描述： Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
中文描述： 風(fēng)扇控制器及遠(yuǎn)端溫度傳感器，帶有SMBus串行接口
文件頁(yè)數(shù)： 9/20頁(yè)
文件大小： 213K
代理商： MAX1669
M
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
_______________________________________________________________________________________
9
mode, the
ALERT
and
OVERT
outputs respond correct-
ly according to the last valid A/D result.
Note that the
ALERT
output does not respond to T
CRIT
(
OVERT
) comparisons.
The
OVERT
latch can implement an override control to
the FAN output, which forces the fan to V
CC
whenever
the T
CRIT
threshold is crossed. This override switch is
the backup fan control loop, and is enabled through the
FAN ON bit in the configuration register (bit 2). Note
that changing the duty to 100% in this way doesn’t
affect the contents of the DUTY register, and the FAN
output reverts to the preprogrammed duty factor (or
DAC voltage) when the
OVERT
latch is reset.
Diode Fault Alarm
A continuity fault detector at DXP detects whether the
remote diode has an open-circuit condition, short-cir-
cuit to GND, or short-circuit DXP-to-DXN condition. At
the beginning of each conversion, the diode fault is
checked and the status byte updated. This fault detec-
tor is a simple voltage detector; DXP rising above V
CC
-
1V or falling below DXN + 40mV constitutes a fault con-
dition. Also, if the ADC has an extremely low differential
input voltage, the diode is assumed to be shorted and
a fault occurs. Note that the diode fault isn’t checked
until a conversion is initiated, so immediately after
power-on reset the status byte indicates no fault is pre-
sent even if the diode path is broken. Any diode fault
will return a +127°C fault reading and cause
ALERT
to
go low.
Write Byte Format
Read Byte Format
7-bit slave address:
equivalent to chip-select line
Command byte: selects which
register you are writing to
Data byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Slave address:
equivalent to chip-select
line
Command byte: selects
which register you are
reading from
Slave address: repeated
due to change in data-
flow direction
Data byte: reads from
the register set by the
command byte
S = Start condition
P = Stop condition
Shaded = Slave transmission
A
= Not acknowledged
Figure 3. SMBus Protocols
S
1
WR
1
ACK
1
COMMAND
8 bits
ACK
1
S
1
ADDRESS
7 bits
RD
1
ACK
1
DATA
8 bits
A
1
P
1
1
S
ADDRESS
7 bits
1
WR
ACK
1
8 bits
COMMAND
ACK
1
8 bits
DATA
ACK
1
1
P
TEMP (
°
C)
ROUNDED
TEMP (
°
C)
+0.25
+0.00
-0.25
-0.50
-0.75
-1.00
-25.00
-25.50
-54.75
-55.00
-65.00
-70.00
+0
+0
+0
+0
-1
-1
-25
-26
-55
-55
-65
-65
+0.50
+1
+25.25
+25
+126.00
+126
+127.00
+126.50
+130.00
+127
+127
+127
DIGITAL OUTPUT
DATA BITS
SIGN
MSBs
LSBs
1
1
1
1
1
1
1
111
110
110
100
100
011
011
1111
0111
0110
1001
1001
1111
1111
0
0
0
0
1
000
000
000
000
111
0000
0000
0000
0000
1111
0
000
0001
0
001
1001
0
111
1110
0
0
0
111
111
111
1111
1111
1111
Table 1. Data Format (Two
’
s Complement)
ADDRESS
7 bits
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參數(shù)描述
MAX1669EEE 制造商:Maxim Integrated Products 功能描述:FAN CONTROLLER AND REMOTE TEMPERATURE SENSOR - Bulk
MAX1669EEE+ 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 16QSOP - Rail/Tube
MAX1669EEE+T 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 16QSOP - Tape and Reel
MAX1669EEE-T 制造商:Maxim Integrated Products 功能描述:FAN CONTROLLER AND REMOTE TEMPERATURE SENSOR - Tape and Reel
MAX166ACPP 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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