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參數資料
型號: MAX7500MTA+T
廠商: Maxim Integrated
文件頁數: 8/13頁
文件大小: 710K
描述: IC TEMP SENSOR DGTL 8TDFN
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
功能: 溫度監視系統(傳感器),監視器
傳感器類型: 內部
感應溫度: -55°C ~ 125°C
精確度: ±3°C(最小值)
拓撲: ADC(三角積分型),寄存器庫
輸出類型: I²C?/SMBus?
輸出警報:
輸出風扇:
電源電壓: 3 V ~ 5.5 V
工作溫度: -55°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-WFDFN 裸露焊盤
供應商設備封裝: 8-TDFN-EP(2x2)
包裝: 帶卷 (TR)
Register Descriptions
The MAX7500MAX7504 have an internal pnp-junction-
based temperature sensor whose analog output is con-
verted to digital form using a 9-bit sigma-delta ADC.
The measured temperature and temperature configura-
tions are controlled by the temperature, configuration,
T
HYST
, and T
OS
registers. See Table 2.
Temperature Register
Read the measured temperature through the tempera-
ture register. The temperature data format is 9 bits,
twos complement, and the register is read out in 2
bytes: an upper byte and a lower byte. Bit D15 is the
sign bit. When bit D15 is 1, the temperature reading is
negative. When bit D15 is zero, the temperature read-
ing is positive. Bits D14D7 contain the temperature
data, with the LSB representing 0.5癈 and the MSB
representing 64癈 (see Table 3). The MSB is transmit-
ted first. The last 7 bits of the lower byte, bits D6D0,
are dont cares. When reading the temperature register,
bits D6D0 must be ignored. When the measured tem-
perature is greater than +127.5癈, the value stored in
the temperature register is clipped to 7F8h. When the
measured temperature is below -64癈, the value in the
temperature register is clipped to BF8h.
During the time of reading the temperature register, any
changes in temperature are ignored until the read is
completed. The temperature register is updated upon
completion of the next conversion.
Table 3 lists the temperature register definition.
Configuration Register
The 8-bit configuration register sets the fault queue, OS
polarity, shutdown control, and whether the OS output
functions in comparator or interrupt mode. When writing
to the configuration register, set bits D7, D6, and D5 to
zero. See Table 5.
Bits D4 and D3, the fault queue bits, determine the
number of faults necessary to trigger an OS condition.
See Table 6. The number of faults set in the queue must
occur to trip the OS output. The fault queue prevents
OS false tripping in noisy environments.
Set bit D2, the OS polarity bit, to zero to force the OS
output active low. Set bit D2 to 1 to set the OS output
polarity to active high. OS is an open-drain output
under all conditions and requires a pullup resistor to
output a high voltage. See Figure 4.
Set bit D1, the comparator/interrupt bit to zero to run
the overtemperature shutdown block in comparator
mode. In comparator mode, OS is asserted when the
temperature rises above the T
OS
value. OS is deassert-
ed when the temperature drops below the T
HYST
value.
Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection
8  _______________________________________________________________________________________
REGISTER NAME
ADDRESS (HEX)
POR STATE (HEX)
POR STATE
(BINARY)
POR STATE (?/SPAN>C)
READ/
WRITE
Temperature
00



Read only
Configuration
01
00
0000 0000

R/W
T
HYST
02
4B0
0100 1011 0
75
R/W
T
OS
03
500
0101 0000 0
80
R/W
Table 2. Register Functions
UPPER BYTE
LOWER BYTE
D15
D14
D13
D12
D11    D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign bit
1= Negative
0 = Positive
MSB
64癈
32癈    16癈    8癈
4癈
2癈
1癈
LSB
0.5癈
X
X
X
X
X
X
X
DIGITAL OUTPUT
TEMPERATURE (?/SPAN>C)
BINARY
hex
+125
0111 1101 0xxx xxxx
7D0x
+25
0001 1001 0xxx xxxx
190x
+0.5
0000 0000 1xxx xxxx
008x
0
0000 0000 0xxx xxxx
000x
-0.5
1111 1111 1xxx xxxx
FF8x
-25
1110 0111 0xxx xxxx
E70x
-55
1100 1001 0xxx xxxx
C90x
Table 3. Temperature Register Definition
Table 4. Temperature Data Output
X = Dont care.
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