LM75BGD,125 NXP Semiconductors, LM75BGD,125 Datasheet - Page 10

• 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
7.5 OS output and polarity
7.6 OS comparator and interrupt modes
Table 12.
The OS output is an open-drain output and its state represents results of the device
watchdog operation as described in
external pull-up resistor is needed. The resistor should be as large as possible, up to
200 k , to minimize the Temp reading error due to internal heating by the high OS sinking
current.
The OS output active state can be selected as HIGH or LOW by programming bit B2
(OS_POL) of register Conf: setting bit OS_POL to logic 1 selects OS active HIGH and
setting bit B2 to logic 0 sets OS active LOW. At power-up, bit OS_POL is equal to logic 0
and the OS active state is LOW.
As described in
comparison between register Temp data and the programmed limits, in registers Tos and
Thyst, in different ways depending on the selected OS mode: OS comparator or
OS interrupt. The OS mode is selected by programming bit B1 (OS_COMP_INT) of
register Conf: setting bit OS_COMP_INT to logic 1 selects the OS interrupt mode, and
setting to logic 0 selects the OS comparator mode. At power-up, bit OS_COMP_INT is
equal to logic 0 and the OS comparator is selected.
The main difference between the two modes is that in OS comparator mode, the OS
output becomes active when Temp has exceeded T
dropped below T
change the state of the OS output; while in OS interrupt mode, once it has been activated
either by exceeding T
indefinitely until reading a register, then the OS output is reset.
Temperature limits T
OS output state will be undefined.
11-bit binary
(2’s complement)
0 1111 1010
0 0011 0010
0 0000 0001
0 0000 0000
1 1111 1111
1 1100 1110
1 1001 0010
Tos and Thyst limit data and value
Section
hys
, reading a register or putting the device into shutdown mode does not
th(ots)
Rev. 02 — 9 December 2008
th(ots)
Hexadecimal value
0FA
032
001
000
1FF
1CE
192
7.1, the device OS output responds to the result of the
and T
or dropping below T
hys
must be selected so that T
Digital temperature sensor and thermal watchdog
Section
7.1. In order to observe this output state, an
Decimal value
250
50
1
0
1
50
110
hys
, the OS output will remain active
th(ots)
and reset when Temp has
th(ots)
> T
Value
+125.0 C
+25.0 C
+0.5 C
0.0 C
0.5 C
25.0 C
55.0 C
hys
© NXP B.V. 2008. All rights reserved.
. Otherwise, the
LM75B
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