SE95DP NXP Semiconductors, SE95DP Datasheet - Page 4

• Manufacturer Part Number: SE95DP
• Description: IC, TEMP SENSOR, DIGITAL, 8TSSOP
• Manufacturer: NXP Semiconductors

Specifications of SE95DP

• Ic Output Type: Digital
• Sensing Accuracy Range: ± 2°C
• Supply Current: 150µA
• Supply Voltage Range: 2.8V To 5.5V
• Resolution (bits): 13bit
• Sensor Case Style: TSSOP
• No. Of Pins: 8
• Base Number: 95
• Temperature Sensing Range: -55°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
7. Functional description
SE95_7
Product data sheet
7.1 General operation
Table 2.
The SE95 uses the on-chip band gap sensor to measure the device temperature with a
resolution of 0.03125 C and stores the 13-bit two’s complement digital data, resulting
from 13-bit analog to digital conversion, into register Temp. Register Temp can be read at
any time by a controller on the I
conversion in progress during the read operation.
The device can be set to operate in either mode: normal or shutdown mode. In normal
operation mode, by default, the temperature-to-digital conversion is executed every
100 ms and register Temp is updated at the end of each conversion. In shutdown mode,
the device becomes idle, data conversion is disabled and register Temp holds the latest
result; however, the device I
can be performed. The device operation mode is controlled by programming bit
SHUTDOWN of register Conf. The temperature conversion is initiated when the device is
powered up or returned to normal mode from shutdown mode.
In addition, at the end of each conversion in normal mode, the temperature data (or Temp)
in register Temp is automatically compared with the overtemperature shutdown threshold
data (or Tos) stored in register Tos, and the hysteresis data (or Thyst) stored in register
Thyst, in order to set the state of the device OS output accordingly. The registers Tos and
Thyst are write/read capable, and both operate with 9-bit two’s complement digital data.
To match with this 9-bit operation, register Temp uses only the 9 MSB bits of its 13-bit data
for the comparison.
The device temperature conversion rate is programmable and can be chosen to be one of
the four values: 0.125, 1.0, 10, and 30 conversions/s. The default conversion rate is
10 conversions/s. Furthermore, the conversion rate is selected by programming bits
RATEVAL[1:0] of register Conf as shown in
as well as the device power consumption increase with the conversion rate.
The way that the OS output responds to the comparison operation depends upon the OS
operation mode selected by configuration bit OS_COMP_INT, and the user-defined fault
queue defined by configuration bits OS_F_QUE[1:0].
In OS comparator mode, the OS output behaves like a thermostat. It becomes active
when the temperature exceeds T
Reading the device registers or putting the device into shutdown mode does not change
the state of the OS output. The OS output in this case can be used to control cooling fans
or thermal switches.
Symbol
A1
A0
V
CC
Pin description
Pin
6
7
8
Ultra high accuracy digital temperature sensor and thermal watchdog
Rev. 07 — 2 September 2009
Description
user-defined address bit 1 digital input
user-defined address bit 0 digital input
supply voltage
…continued
2
C-bus interface is still active and register write/read operation
2
C-bus. Reading temperature data does not affect the
os
, and is reset when the temperature drops below T
Table
6. Note that the average supply current
© NXP B.V. 2009. All rights reserved.
SE95
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hyst
.