NOIP1FN2000A-QDI datasheet(39/75 Pages) ONSEMI

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NOIP1SN5000A

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Temperature Sensor

The PYTHON has an on−chip temperature sensor which

returns a digital code (Tsensor) of the silicon junction

temperature. The Tsensor output is a 8−bit digital count

between 0 and 255, proportional to the temperature of the

silicon substrate. This reading can be translated directly to

a temperature reading in

°C by calibrating the 8−bit readout

at 0

°C and 85°C to achieve an output accuracy of ±2°C. The

Tsensor output can also be calibrated using a single

temperature point (example: room temperature or the

ambient temperature of the application), to achieve an

output accuracy of

±5°C.

Note that any process variation will result in an offset in

the bit count and that offset will remain within

±5°C over the

temperature range of 0

°C and 85°C. Tsensor output digital

code can be read out through the SPI interface.

Output of the temperature sensor to the SPI:

tempd_reg_temp<7:0>: This is the 8−bit N count readout

proportional to temperature.

Input from the SPI:

The reg_tempd_enable is a global enable and this enables

or disables the temperature sensor when logic high or logic

low respectively. The temperature sensor is reset or disabled

when the input reg_tempd_enable is set to a digital low state.

Calibration using one temperature point

The temperature sensor resolution is fixed for a given type

of package for the operating range of 0

°C to +85°C and

hence devices can be calibrated at any ambient temperature

of the application, with the device configured in the mode of

operation.

Interpreting the actual temperature for the digital code

readout:

The formula used is

TJ = R (Nread − Ncalib) + Tcalib

TJ = junction die temperature

R = resolution in degrees/LSB (typical 0.75 deg/LSB)

Nread = Tsensor output (LSB count between 0 and 255)

Tcalib = Tsensor calibration temperature

Ncalib = Tsensor output reading at Tcalib

Monitor Pins

The internal sequencer has two monitor outputs (monitor0

and monitor1) that can be used to communicate the internal

states from the sequencer. A three−bit register configures the

assignment of the pins as shown in Table 30.

Table 30. REGISTER SETTING FOR THE MONITOR SELECT PIN

monitor_select [2:0]

192 [13:11]

monitor pin

Description

0x0

monitor0

monitor1

‘0’

0x1

monitor0

monitor1

Integration Time

ROT Indication (‘1’ during ROT, ‘0’ outside)

0x2

monitor0

monitor1

Integration Time

Dual/Triple Slope Integration (asserted during DS/TS FOT sequence)

0x3

monitor0

monitor1

Start of x−Readout Indication

Black Line Indication (‘1’ during black lines, ‘0’ outside)

0x4

monitor0

monitor1

Frame Start Indication

Start of ROT Indication

0x5

monitor0

monitor1

First Line Indication (‘1’ during first line, ‘0’ for all others)

Start of ROT Indication

0x6

monitor0

monitor1

ROT Indication (‘1’ during ROT, ‘0’ outside)

Start of X−Readout Indication

0x7

monitor0

monitor1

Start of X−readout Indication for Black Lines

Start of X−readout Indication for Image Lines

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