User's Manual l TQMa7x UM 0203 l © 2022, TQ-Systems GmbH
Page 36
The pull-up at RESET_OUT# can be connected to voltages greater than 3.3 V. In any case the max. input current of 50 mA and the
specification of the used output driver 74LVC1G07 from NXP must be observed.
3.2.7
Power supply
3.2.7.1
TQMa7x power supply
The TQMa7x only requires a single 5 V ±5 % supply. No other voltage is required.
In addition to the PMIC from NXP, another voltage converter (DCDC4V2) is used on the TQMa7x. This is used to generate the
basic supply voltage of the PMIC. The following block diagram shows the TQMa7x power supply:
Connector
i.MX7
VCC2
VCC1
VCCn
Module
components
PMIC
DC/DC
converter
5 V
4.2 V
Figure 15: Block diagram TQMa7x power supply
The characteristics and functions of the pins and signals are to be taken from the PMIC Data Sheet (4) and the
i.MX7 Data Sheets (1), (2).
3.2.7.2
Other TQMa7x supply inputs
In addition to VCC5V two more supply inputs are provided by the TQMa7x.
Table 46:
TQMa7x Supply inputs
Voltage
Pin
Usage
V
IN
I
IN
VCC1V8_IN
X1-66
Supplies i.MX7 rails for temperature sensor and ADC
Connect to VCC1V8_OUT or external supply voltage
1.71 V to 1.89 V, 1.8 V typ.
15 mA
LICELL
X1-19
RTC supply
Connected to PMIC-LICELL or DS1339, if assembled
See PMIC Data Sheet (4) and
DS1339 Data Sheet (9)
Attention: Malfunction or destruction
When using an external supply at VCC1V8_IN the power sequencing of the CPU must be respected.
Therefore VCC1V8_OUT should be used as enable for the external supply.
