LM75BGD NXP Semiconductors, LM75BGD Datasheet - Page 11

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

Specifications of LM75BGD

• Ic Output Type: Digital
• Sensing Accuracy Range: ± 3°C
• Supply Current: 100µA
• Supply Voltage Range: 2.8V To 5.5V
• Resolution (bits): 11bit
• No. Of Pins: 8
• Package / Case: XSON
• Base Number: 75
• Temperature Sensing Range: -55°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
LM75B_2
Product data sheet
7.7 OS fault queue
7.8 Shutdown mode
7.9 Power-up default and power-on reset
Fault queue is defined as the number of faults that must occur consecutively to activate
the OS output. It is provided to avoid false tripping due to noise. Because faults are
determined at the end of data conversions, fault queue is also defined as the number of
consecutive conversions returning a temperature trip. The value of fault queue is
selectable by programming the two bits B4 and B3 (OS_F_QUE[1:0]) in register Conf.
Notice that the programmed data and the fault queue value are not the same.
shows the one-to-one relationship between them. At power-up, fault queue data = 0 and
fault queue value = 1.
Table 13.
The device operation mode is selected by programming bit B0 (SHUTDOWN) of register
Conf. Setting bit SHUTDOWN to logic 1 will put the device into shutdown mode. Resetting
bit SHUTDOWN to logic 0 will return the device to normal mode.
In shutdown mode, the device draws a small current of approximately 1.0 A and the
power dissipation is minimized; the temperature conversion stops, but the I
interface remains active and register write/read operation can be performed. When the
shutdown is set, the OS output will be unchanged in comparator mode and reset in
interrupt mode.
The LM75B always powers-up in its default state with:
When the power supply voltage is dropped below the device power-on reset level of
approximately 1.0 V (POR) for over 2 s and then rises up again, the device will be reset
to its default condition as listed above.
Fault queue data
OS_F_QUE[1]
0
0
1
1
•
•
•
•
•
•
Normal operation mode
OS comparator mode
T
T
OS output active state is LOW
Pointer value is logic 00 (Temp)
th(ots)
hys
= 75 C
Fault queue table
= 80 C
Rev. 02 — 9 December 2008
OS_F_QUE[0]
0
1
0
1
Digital temperature sensor and thermal watchdog
Fault queue value
Decimal
1
2
4
6
© NXP B.V. 2008. All rights reserved.
LM75B
2
C-bus
Table 13
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