參數(shù)資料
型號(hào)： LM75ADP
廠商： NXP Semiconductors N.V.
元件分類： 工業(yè)控制
英文描述： Digital temperature sensor and thermal watchdog
封裝： LM75AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 17, 2005,;LM75AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 17, 2005,;LM
文件頁(yè)數(shù)： 6/24頁(yè)
文件大小： 137K
代理商： LM75ADP
LM75A_4
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 04 — 10 July 2007
6 of 24
NXP Semiconductors
LM75A
Digital temperature sensor and thermal watchdog
8 devices can be connected to the same bus without address conflict. Because the input
pins, SCL, SDA and A2 to A0, are not internally biased, it is important that they should not
be left floating in any application.
7.4 Register list
The LM75A contains four data registers beside the pointer register as listed in
Table 5
.
The pointer value, read/write capability and default content at power-up of the registers
are also shown in
Table 5
.
7.4.1
Pointer register
The Pointer register contains an 8-bit data byte, of which the two LSB bits represent the
pointer value of the other four registers, and the other 6 MSB bits are equal to 0, as shown
in
Table 6
and
Table 7
. The Pointer register is not accessible to the user, but is used to
select the data register for write/read operation by including the pointer data byte in the
bus command.
Because the Pointer value is latched into the Pointer register when the bus command
(which includes the pointer byte) is executed, a read from the LM75A may or may not
include the pointer byte in the statement. To read again a register that has been recently
read and the pointer has been preset, the pointer byte does not have to be included. To
Table 4.
1 = HIGH; 0 = LOW.
MSB
1
Address table
LSB
A0
0
0
1
A2
A1
Table 5.
Register
name
Conf
Register table
Pointer
value
01h
R/W
POR
state
00h
Description
R/W
Configuration register: contains a single 8-bit data
byte; to set the device operating condition; default = 0.
Temperature register: contains two 8-bit data bytes;
to store the measured Temp data.
Overtemperature shutdown threshold register:
contains two 8-bit data bytes; to store the
overtemperature shutdown T
os
limit; default = 80
°
C.
Hysteresis register: contains two 8-bit data bytes;
to store the hysteresis T
hyst
limit; default = 75
°
C.
Temp
00h
read only
n/a
Tos
03h
R/W
5000h
Thyst
02h
R/W
4B00h
Table 6.
B7
0
Pointer register
B6
0
B5
0
B4
0
B3
0
B2
0
B[1:0]
pointer value
Table 7.
B1
0
0
1
1
Pointer value
B0
0
1
0
1
Selected register
Temperature register (Temp)
Configuration register (Conf)
Hysteresis register (Thyst)
Overtemperature shutdown register (Tos)
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