Hardware Interface - RoyalTek RET-3570LP User Manual

1.10 Hardware interface

Interface Pin Number:
Pin # Signal Name
1 V_GPS_3V3
2 GND
3 BOOT
4 RXA
5 TXA
6 TXB
7 RXB
8 N.C
9 RF_ON
10 GND
11 AUDIO_R
12 AUDIO_L
13 GND
14 FM_RF_IN
RoyalTek Confidential
I/O Description
I DC Supply Voltage input
G Ground
I Boot mode
I Serial port A
O Serial port A
O Serial port B
I Serial port B
Indicates power state of RF
O
part
G Ground
O Audio right channel output
O Audio Left channel output
G Ground
I FM antenna input
RET-3570LP User Manual
Characteristics
DC +3.3V±5%
Reference Ground
≤ ≤
. 1 995 V V . 3 15 V
IH
≤ ≤
. 1 995 V V . 3 15 V
IH
≤ ≤
. 2 375 V V . 2 85
OH
≤ ≤
. 2 375 V V . 2 85
OH
≤ ≤
. 1 995 V . 3 15 V
IH
= =
V . 2 85 V ; V
OH OL
Reference Ground
V Output voltage 66mV(typical) ~75mV(max)
AFL
R Output resistance 50 Ω (min) ~ 100 Ω
AFL
V
Output voltage 66mV(typical) ~75mV(max)
AFL
R
Output resistance 50 Ω (min) ~ 100 Ω
AFL
Reference Ground
FM antenna input
10
≤ ≤
- 0.3V V . 0
IL
≤ ≤
- 0.3V V . 0
IL
≤
V V . 0
OL
≤
V V . 0
OL
≤ ≤
- 0.3V V . 0
IL
0 V
855 V
855 V
715 V
715 V
855 V