User Manual
Table Of Contents
- 1. Introduction
- 2. GR47/GR48 Radio Devices
- 3. Abbreviations
- 4. Mechanical Description
- 5. System Connector Interface
- 5.1 Overview
- 5.2 General Electrical and Logical Characteristics
- 5.3 Grounds
- 5.4 VCC - Regulated Power Supply Input
- 5.5 Battery Charging Input (CHG_IN)
- 5.6 Turning the Radio Device ON/OFF and the External Power Signal
- 5.7 Analogue Audio
- 5.8 PCM Digital Audio
- 5.9 Serial Data Interfaces
- 5.10 SIM Card Related Signals
- 5.11 Service/Programming
- 5.12 Buzzer
- 5.13 LED
- 5.14 General Purpose Digital I/O Ports
- 5.15 Extended I/O capabilities
- 5.16 General Purpose Analogue I/O Ports
- 5.17 External I 2C Serial Control Bus
- 5.18 TX_ON - Burst Transmission
- 5.19 Real Time Clock
- 6. Antenna Connector
- 7. Keyboard Interface
- 8. Hints for Integrating the Radio Device
- 9. Embedded Applications
- 10. TCP/IP Stack
- 11. Technical Data
- 12. Declaration of Conformity
- 13. Introduction to the Developer’s Kit
- 14. Using the Developer’s Kit
5. SYSTEM CONNECTOR INTERFACE
26
LZT 123 7589 R1A
(1)
The GR47 measures the voltage at VCC during the power-up sequence.
It is important that both VCC and ON/OFF reach a minimum of 3.2V before
the ON/OFF low pulse is initiated.
(2)
In SERVICE mode.
t
9,2
Time after start of
ON/OFF pulse
when VIO is
active
VCC > 3.2V - 45.0 - ms
t
38/6(
Application ON/
OFF pulse width
ON/OFF held low
until detected
by software
400 500 - ms
t
3567
Internal Power-
on reset signal
initiates software
100 - 200 ms
t
&76
Time when
software
controlled CTS
signal indicates
module READY
CTS signal
configured for
RS232 hardware
flow control, not
GPIO pin
- 0.35
3.0
(2)
s