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3.6.3. Reference Design for Power Supply
Power design for the module is very important, as the performance of the module largely depends on the power
source. If the voltage drop between the input and output is not too high, it is recommended to use an LDO to supply
power for the module. If there is a big voltage difference between the input source and the desired output (VBAT),
a buck converter is preferred to be used as the power supply.
The following figure shows a reference design for 12/24 V input power source. The designed output for the power
supply is about 3.8 V and the maximum rated current is 5 A.
DC_IN
100 µ H
470 µF
NOTE
To avoid damaging internal flash, do not switch off the power supply when the module works normally. Only after
the module is turned off by PWRKEY, the power supply can be cut off.
3.6.4. Monitor the Power Supply
API can be used to monitor the VBAT_BB voltage value. For more details, see document [2].
3.7. Power on and off Scenarios
3.7.1. Turn on Module with PWRKEY
Table 8: PWRKEY Pin Description
Pin Name
Pin No.
AG521R-NA_QuecOpen_Hardware_Design
1
2
3
4
5V_EN
Figure 9: 12/24 V Power Supply System Reference Design
Description
AG521R-NA QuecOpen Hardware Design
100 nF
8
BOOT
SW
7
VIN
GND
TPS54 560-Q1
6
EN
COMP
5
RT/CLK
FB
9
DC Characteristics
Automotive Module Series
7.2 µH
220 µF
Comment
42 / 92
DC_3V8
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