User's Manual l MBa57xx UM 0100 l © 2020, TQ-Systems GmbH
Page 13
4.1.3
Temperature sensor
The MBa57xx does not provide a temperature sensor. However, on the top side of the TQMa57xx is a temperature sensor
SE97BTP with integrated EEPROM.
4.1.4
RTC backup
The TQMa57xx provides a DS1339U-33 RTC, which is connected to the I2C1 bus.
To supply the RTC on the TQMa57xx, a 3V lithium battery type CR2032 with very low self-discharge is mounted on the MBa57xx.
The following tables show details of the RTC backup supply.
Table 10:
RTC backup supply
Parameter
Value
Remark
Coin cell voltage
2.1 V to 3.7 V
3.0 V typical
Current consumption discrete RTC DS1339U-33
440 nA typical
0.7 µA maximal @ T
amb
= +25 °C
