User's Manual
Table Of Contents
- 1: Purpose
- 2: Scope
- 3: VAM-CM Overview
- 4: VAM-CM interfaces
- 4.1: Absolute maximum ratings
- 4.2: VAM Control interface description
- 4.2.1: System USB description
- 4.2.2: USIM interface description
- 4.2.3: VAM control UART interface description
- 4.2.4: Analog Audio interface description
- 4.2.5: Digital Audio interface description
- 4.2.6: Power Supply interface description
- 4.2.7: External VRTC Supply Functionality
- 4.2.8: Control and ID interface description
- 4.3: Radio interface description
- 4.4: VAM-CM Power Management Handling
- 4.5: Mechanical interface
- 4.6: Environmental conditions
- 5: Evaluation tools
DRAFT
5: Evaluation tools
5.2.2.3:USB Interface
USB interface is implemented with Keystone Electronics 924 B-type USB connector CN-1001. Signal
order in connector is.
Pin Control Description
#1 VBUS USB Bus voltage
#2 Dm Negative data line
#3 Dp Positive data line
#4 GND
Table 18. USB interface signals
5.2.2.4:VAM control interface
The evaluation module control interface CN1005 includes most of VAM-CM controls. Only audio
interface is separated to its own pin header. VAM control interface enables connection of the SIM,
applying button and switch controls and getting the status of VAM-CM indicators.
VAM Power can also be supplied via the VAM control interface together with interface voltage Vio.
With Vio user can select suitable interface voltage level between 1,65V and 5,5v. Default 3,0V Vio is
supplied also in pin header and by default it is applied with jumper between pin #13 and #14. If
custom Vio is applied then jumper is removed and Vio is fed in pin #14 from external source.
The VAM control interface allows VAM terminal manufacturer to use external controller to adjust
VAM-CM settings. Control interface is 2 row 32 way pin header Harwin M20-9721645 which provides
following controls shown in
Table 19
. Pin organization is shown in
Figure 20
.
Pin Control Description
#1 …
#6
VBAT 3,9V supply for VAM-CM
#7 ...
#12
GND
#13 3,0V Vio
output
Power supply for Vio
#14 Vio input Supply input for Vio.
By default this is connected to pin #13
#15 Ext Vrtc
supply
External backup voltage supply to enable possibility to arrange external battery
backup supply for RTC and backup features.
3,3V (maximum load 1mA)
#16 VAM-CM
Wake-up
VAM-CM wake-up control input
“Rising edge” – Modem wake-up
#17 PWR on/off Power on/off switching of VAM-CM.
"LOW" 1 second pulse PWR on/off
"HIGH" (Float) no action
27:GSPS Core Module 2.0 VAM-CM HW Description
Confidential and Proprietary – Inmarsat Global Limited
inmarsat.com