AAC Technologies Pte Ltd 357HP 用户手册
Module Specification
NO.
AT357HP
TITLE:
Module, ZigBee, 17.9 x 24.9 x 2.75mm, 51 I/O, Edge Castellated, SMD
REVISION DATE:
8 April 2013
ISSUE:
O
PAGE:
19 of 27
4.3
Power Supply Design
Excessive noise or ripple (from switching DC-DC regulator) which is decoupled into power
supply pin will lead to severe radio performance degradation. Therefore, it’s a must to
implement proper power supply decoupling circuits in order to sharply suppress any
undesired noise.
Figure 11. Power supply decoupling circuits
The decoupling capacitors can be in value of 10uF, 1uF and 10pF. The placement of three
decoupling capacitor must be in the following order: 10uF (C1), 1uF (C2) and followed by
10pF (C3) which is closer to power supply pin.
4.4
External Flash Memory
The AT357 can support bootloader feature that allows a node to update its image on
demand, either by serial communication or over the air (OTA). The boot loading program is
stored in external flash memory (for example AT45DB021D from ATMEL) which is accessible
using SPI communication (refer to Figure 8b for signal connection).
4.5
ADC
The AT357 has offered 24 multi-purpose GPIO ports. Six of them may be individually
configured as ADC input.
Analog Signal Pin
Module Pin Number
GPIO port
ADC0
40
PB5
ADC1
39
PB6
ADC2
38
PB7
ADC3
36
PC1
ADC4
22
PA4
ADC5
23
PA5
Table 11: ADC Pins
Refer to EM35x datasheet (120-035x-000M) for detailed configuration.
AT357
VDD (pin 34)