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10
RET-3570LP User Manual
1.10 Hardware interface
Interface Pin Number:
Pin # Signal Name I/O Description Characteristics
1 V_GPS_3V3 I DC Supply Voltage input
DC +3.3V±5%
2 GND G Ground Reference Ground
3 BOOT I Boot mode
VVVVV
ILIH
855.00.3V- 15.3995.1 ≤≤
≤
≤
4 RXA I Serial port A
VVVVV
ILIH
855.00.3V- 15.3995.1 ≤≤
≤
≤
5 TXA O Serial port A
VVVVV
OLOH
715.0 85.2375.2 ≤
≤
≤
6 TXB O Serial port B
VVVVV
OLOH
715.0 85.2375.2 ≤
≤
≤
7 RXB I Serial port B
VVVV
ILIH
855.00.3V- 15.3995.1 ≤≤
≤
≤
8 N.C
9 RF_ON O
Indicates power state of RF
part
VVVV
OLOH
0 ; 85.2
=
=
10 GND G Ground Reference Ground
11 AUDIO_R O Audio right channel output
AFL
V Output voltage 66mV(typical) ~75mV(max)
AFL
R Output resistance 50Ω(min) ~ 100Ω
12 AUDIO_L O Audio Left channel output
AFL
V Output voltage 66mV(typical) ~75mV(max)
AFL
R Output resistance 50Ω(min) ~ 100Ω
13 GND G Ground Reference Ground
14 FM_RF_IN
I FM antenna input
FM antenna input