Mode Select (Option1 And Option2) - Motorola MTH500 Service Manual

Theory of Operation
MODE
NORMAL (no accessory)
USB Accessory/Computer
Dumb Accessory
Phone Powered USB Accessory
RS-232 (8 wire)/IDB Smart Cable
RS-232 (4 wire)/SSI
PTT
SB9600
Pin
Signal Name (Short Form)
No.
1 Power Ground (GND)
2 Battery Feedback (BATT_FDBK)
3 External Power (EXTB+)
4 USB+/TXD (D+)
5 USB-/RXD (D-)
6 USB Power/Ignition/RTS
(USB_PWR)
7 Switched Battery (SWB+)
8 Hook Switch/CTS (HKSW)
9 MUTE/FS/DCD (MUTE)
10 DUMB_SEL2/SCK/RI (DSEL2)
11 DUMB_SEL1/SRDA/DTR
(DSEL1)
2 - 30

Mode Select (OPTION1 and OPTION2)

Logic levels applied to the OPTION1, OPTION2, USB POWER, and AUDIO IN lines are
used to select the CE Bus mode. The modes will be set as follows:
OPTION_1
1
1
1
1
0
0
0
OPTION_2
1
1
0
0
1
1
0
Power/
Default USB Dumb
States
GND GND GND
BATT_ BATT_ BATT_
FDBK FDBK FDBK
EXTB+ EXTB+ EXTB+
D+ TXD
D- RXD
USB_P IGN
WR
SWB+ SWB+ SWB+
HKSW HKSW
MUTE
DSCEN DSEL2
DSCEN
DSEL1
USB_PWR AUDIO_IN
0 X
>4.0V X
X 1
X 0
X 1
X 0
X X
X X
RS232
RS232/
(8
SSI
wire)
GND GND
BATT_ BATT_
FDBK FDBK
EXTB+ EXTB+
TXD TXD
RXD RXD
RTS RTS
SWB+ SWB+
CTS CTS
FS DCD
SCK RI
SRDA DTR
68P02963C70-O