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Automotive Module Series
AG521R-NA QuecOpen Hardware Design
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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.
2
4
1
3
6
7
8
182K
NM
100K
10 pF
100 pF
100 nF
10 µF
470 µF
100 nF
100 nF
DC_IN
100 µH
5V_EN
100 nF
BOOT
VIN
EN
RT/CLK
SW
GND
COMP
FB
GND
TPS54560-Q1
7.2 µH
9
5
220 µF
1 µF
10 nF
4.3K
4.7 nF
4.7 pF
75k
20k
DC_3V8
Figure 9: 12/24 V Power Supply System Reference Design
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.
Description
DC Characteristics
Comment
NOTE