User Manual
685
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Measurement Unit
22.5
Central and PMU Regulator Temperature Sensor
This module is a quasi combination of a main on-chip temperature sensor and a PMU Regulator temperature
sensor.
Modules Features
• 2 operation modes with
Mode 1 - temperature range corresponds to differential output voltage range 0 …1.2V (output voltage shift
enabled), resolution approximately 10°C.
Mode 2 - temperature range corresponds to differential output voltage range 0.6 …1.2V, resolution approx.
15°C.
• The combined system temperature sensor plus ADC can be calibrated in software using calibration figures
that are stored in the NVM at the production test.
This temperature sensor, including two sensing elements, monitors the chip temperature and PMU Regulator
temperature. One sensing element is placed in the centre of the device to get the average device temperature
status and the other sensing element is close to the PMU Regulator.
The voltage calculation of the Temperature is done with the following formula:
(22.3)
The LSB Voltage is calculated:
(22.4)
Vtemp is the direct proportional to temperature input voltage and is calculated by:
(22.5)
where
the coefficient a
is
628 mV, b is 2,31 mV/K and T
0
is 273 K
:
The next chapter lists the available registers to configure both temperature sensors.
22.5.1
Temperature Sensor Control Register
The Temperature Sensor is fully controllable by the below listed SFR Register.
The registers are addressed bytewise.
Table 362 Register
Overview
Register Short Name
Register Long Name
Offset Address Reset Value
Temperature Sensor Control Register
,
Temperature Sensor Control Register
10
H
0000 0003
H
=
ADC2out
Vtemp
Vlsb
floor (
)
+ 1
=
Vlsb
Vref
256
(
)
(
−
∗
a + b
=
T
T
V
tEMP
T
0
)
