Kirisun TM840 - Page 12

TM840 Service Manual
The second development interface includes the functions of audio, programmableI\O, USB, accessory identification, etc.The
pin definition of interfaces as below.
Pin Signal Name Function Signal Definition
1 Ext_SWB+ Power Supply +13.8V output (Imax<1A)
2 Power Ground Ground Ground
3 USB_D+ USB+ USB Data
(2V<V
IH
<3.3V，0V<V
IL
<0.8V)
4 USB_D- USB- USB Data
(2V<VIH<3.3V，0V<VIL<0.8V)
5 USB_VBus USB Power +5V USB Power
6 USB_GND USB Ground Ground
7 Prgm_In_1(PTT) Programmable Input1 (PTT) Digital Input
(2.5V<VIH<5V，0V<VIL<0.4V)
8 Ext-Spk- External SPK- Audio PA Output-
Load impedance: 16Ω typical.
9 Ext-Spk+ External SPK+ Audio PA Output+
Load impedance: 16Ω typical.
10 ACC_MAP_ID_2 Accessory ID Line 2 Digital I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
11 ACC_MAP_ID_1 Accessory ID Line 1 Digital I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
12 Prgm_IO_6 Programmable I/O 6 Programmable I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
(4V<VOH<5V，0V<VOL<0.4V)
13 Prgm_IO_2(Monitor) Programmable I/O 2 (monitor) Programmable I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
(4V<VOH<5V，0V<VOL<0.4V)
14 Prgm_IO_3(Chan_Act) Programmable I/O 3 (Channel
Activation)
Programmable I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
(4V<VOH<5V，0V<VOL<0.4V)
15 Ground Ground Ground
16 Rx_Audio RX audio output Codec Audio Output
(Wmax=15mW@32Ω)
17 Audio_Ground Audio Ground Ground
18 Tx_Audio TX audio Ext_MIC+ Input (VIN<2.0V)
19 Ground Ground Ground
20 Prgm_IO_7 Programmable I/O 7 Programmable I/O
(2.5V<VIH<5V，0V<VIL<0.4V)
9