TQ-Systems TQMa8Xx, Preliminary User'S Manual

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Preliminary User's Manual l TQMa8Xx UM 0002 l © 2018, TQ-Systems GmbH Page 15
3.2.6 Power
3.2.6.1 Power supply
The TQMa8Xx only requires a single power supply of 3.3 V ±5 %.
The following illustration shows the structure of the TQMa8Xx supply:
Connector
VCC2
VCC1
VCCn
3.3 V
i.MX8X
PMIC
PF8100/
PF8200
Module
components
Illustration 9: Block diagram power supply
3.2.6.2 Power consumption
The power consumption of the TQMa8Xx strongly depends on the application, the mode of operation and the operating system.
For this reason the given values have to be seen as approximate values.
The following table shows power supply and power consumption parameters of the TQMa8Xx:
Table 11: TQMa8Xx power consumption @ 3.3 V
Mode of operation TQMa8XD TQMa8XDP TQMa8XQP Remark
Theoretical calculated peak 1440 mA 4752 mW 1440 mA 4752 mW 1440 mA 4752 mW –
U-Boot prompt 115 mA 380 mW 115 mA 380 mW 130 mA 429 mW –
Linux prompt 95 mA 314 mW 95 mA 314 mW 100 mA 330 mW –
Linux 100 % CPU load 200 mA 660 mW 200 mA 660 mW 220 mA 726 mW –
Reset 26 mA 86 mW 26 mA 86 mW 21 mA 69 mW RESET_IN# = low
Off-Mode 6 mA 20 mW 6 mA 20 mW 6 mA 20 mW PMIC_PWRON = low
3.2.6.3 LICELL
Coin cells can be connected to the LICELL input of the TQMa8Xx connector (X2-23).
Depending on the TQMa8Xx variant, the SNVS domain of the i.MX 8X or the external RTC DS1339U is thus supplied.
The following table shows details of the power consumption at the LICELL pin.
Table 12: TQMa8Xx LICELL
Current consumption Function
Typical 7 µA, max. 10 µA LICELL supplies the i.MX 8X SNVS-Domain via the PMIC‘s VSNVS regulator.
Typical 0.4 µA, max. 7 µA
LICELL supplies the DS1339U RTC on the TQMa8Xx.
The i.MX 8X SNVS domain is only supplied when the TQMa8Xx supply of 3.3 V is present.
Note: Functional scope of RTC
Depending on the TQMa8Xx variant, the range of functions is reduced in battery mode
(only LICELL supplied), since no SNVS function of the i.MX 8X is available when using the DS1339U.