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4.9
RTC
The RTC PCF85063ATL is supported by U-Boot and Linux kernel.
The RTC is powered via V
, battery buffering is possible (battery on carrier board, see Figure 11).
IN
The alarm output INTA# is routed to the module connectors. A wake-up is possible via the system controller.
The RTC is connected to the I
The accuracy of the RTC is primarily determined by the characteristics of the quartz used. The type FC-135 used on the
TQMLS1028A has a standard frequency tolerance of ±20 ppm at +25 °C. (Parabolic coefficient: max. –0.04 × 10
This results in an accuracy of approximately 2.6 seconds / day = 16 minutes / year.
Figure 11:
Block diagram RTC buffering
4.10
Temperature monitoring
Due to the high power dissipation, temperature monitoring is absolutely necessary in order to comply with the specified
operating conditions and thus ensure reliable operation of the TQMLS1028A. The temperature critical components are:
• LS1028A
• DDR4 SDRAM
The following measuring points exist:
• LS1028A temperature:
Measured via diode integrated in LS1028A, read out via external channel of SA56004
• DDR4 SDRAM:
Measured by temperature sensor SE97B
• 3.3 V switching regulator:
SA56004 (internal channel) to measure the 3.3 V switching regulator temperature
The open-drain Alarm Outputs (open drain) are connected and have a Pull-Up to signal TEMP_OS#.
Control via I
2
C controller I2C1 of the LS1028A, device addresses see Table 11.
Further details can be found in the SA56004EDP data sheet (6).
An additional temperature sensor is integrated in the configuration EEPROM, see 4.8.2.
4.11
TQMLS1028A Supply
The TQMLS1028A requires a single supply of 5 V ±10 % (4.5 V to 5.5 V).
User's Manual l TQMLS1028A UM 0101 l © 2020, TQ-Systems GmbH
C controller 1, device address is 0x51 / 101 0001b.
2
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–6
/ °C
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