LM75BGD,125 NXP Semiconductors, LM75BGD,125 Datasheet - Page 6

• Manufacturer Part Number: LM75BGD,125
• Description: IC TEMP SENSOR DGTL 8-UXSON
• Manufacturer: NXP Semiconductors

Specifications of LM75BGD,125

• Package / Case: 8-XSON
• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Oscillator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: + 80 C
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: I2C
• Digital Output - Number Of Bits: 11
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.8 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 100 uA
• Temperature Sensor Function: Temp Sensor
• Operating Temperature (max): 125C
• Operating Temperature Classification: Military
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4769-2; 935288239125

NXP Semiconductors
LM75B_2
Product data sheet
7.2.1 Bus fault time-out
7.2 I
7.3 Slave address
7.4 Register list
The LM75B can be connected to a compatible 2-wire serial interface I
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
not been installed as required for I
is needed for each of these two terminals. The bus communication protocols are
described in
If the SDA line is held LOW for longer than t
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.
The LM75B slave address on the I
device address pins A2, A1 and A0. Each of them is typically connected either to GND for
logic 0, or to V
address. The other four MSB bits of the address data are preset to ‘1001’ by hard wiring
inside the LM75B.
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.
Table 3.
1 = HIGH; 0 = LOW.
The LM75B contains four data registers beside the pointer register as listed in
The pointer value, read/write capability and default content at power-up of the registers
are also shown in
Table 4.
MSB
1
Register
name
Conf
Temp
Tos
Thyst
2
C-bus serial interface
Pointer
value
01h
00h
03h
02h
Address table
Register table
Section
0
CC
for logic 1. These pins represent the three LSB bits of the device 7-bit
Table
Table 3
R/W
R/W
read only
R/W
R/W
7.10.
Rev. 02 — 9 December 2008
4.
0
shows the device’s complete address and indicates that up to
POR
state
00h
n/a
5000h
4B00h
2
2
C-bus, then an external pull-up resistor, about 10 k ,
C-bus is partially defined by the logic applied to the
Digital temperature sensor and thermal watchdog
1
Description
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
default = 80 C.
Hysteresis register: contains two 8-bit data bytes;
to store the hysteresis T
to
(75 ms minimum / 13.3 Hz; guaranteed at
2
A2
C-bus common pull-up resistors have
hys
A1
limit; default = 75 C.
th(ots)
2
C-bus as a slave
© NXP B.V. 2008. All rights reserved.
limit;
LM75B
LSB
A0
Table
6 of 29
4.