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參數(shù)資料
| 型號： | LM75BGD |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Digital temperature sensor and thermal watchdog |
| 封裝： | LM75BD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<Always Pb-free,;LM75BD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<Always Pb-free,; |
| 文件頁數(shù)： | 6/29頁 |
| 文件大?。?/td> | 164K |
| 代理商： | LM75BGD |
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LM75B_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 December 2008
6 of 29
NXP Semiconductors
LM75B
Digital temperature sensor and thermal watchdog
7.2 I
2
C-bus serial interface
The LM75B can be connected to a compatible 2-wire serial interface I
2
C-bus as a slave
device under the control of a controller or master device, using two device terminals, SCL
and SDA. The controller must provide the SCL clock signal and write/read data to/from the
device through the SDA terminal. Notice that if the I
2
C-bus common pull-up resistors have
not been installed as required for I
2
C-bus, then an external pull-up resistor, about 10 k
,
is needed for each of these two terminals. The bus communication protocols are
described in
Section 7.10
.
7.2.1
Bus fault time-out
If the SDA line is held LOW for longer than t
to
(75 ms minimum / 13.3 Hz; guaranteed at
50 ms minimum / 20 Hz), the LM75B will reset to the idle state (SDA released) and wait
for a new START condition. This ensures that the LM75B will never hang up the bus
should there be conflict in the transmission sequence.
7.3 Slave address
The LM75B slave address on the I
2
C-bus is partially defined by the logic applied to the
device address pins A2, A1 and A0. Each of them is typically connected either to GND for
logic 0, or to V
CC
for logic 1. These pins represent the three LSB bits of the device 7-bit
address. The other four MSB bits of the address data are preset to ‘1001’ by hard wiring
inside the LM75B.
Table 3
shows the device’s complete address and indicates that up to
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 LM75B contains four data registers beside the pointer register as listed in
Table 4
.
The pointer value, read/write capability and default content at power-up of the registers
are also shown in
Table 4
.
Table 3.
1 = HIGH; 0 = LOW.
MSB
1
Address table
LSB
A0
0
0
1
A2
A1
Table 4.
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
th(ots)
limit;
default = 80
°
C.
Hysteresis register: contains two 8-bit data bytes;
to store the hysteresis T
hys
limit; default = 75
°
C.
Temp
00h
read only
n/a
Tos
03h
R/W
5000h
Thyst
02h
R/W
4B00h
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