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Maestro A2200-A Manual de usuario Pagina 21

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V1.0 – Aug-13
User’s Manual
Page 21 of 37
5.2 Description A2235-H Signals
Pin
Symbol
Function
Description
1
nRST
Input
Reset input, active low
2
GPIO3
None
Leave open
3
VCC3V3
Power Supply
3.0 – 3.6 V DC
4
WAKEUP
Output
- Status of digital section, Push-Pull output
Low = OFF, KA (Keep Alive)-only, Hibernate, or Standby
mode
High = ON, operational mode
- Connect it to ON_OFF pin for self-start mode
5
Vout
Voltage Output
Permanent 1.8V voltage output for up to 20mA current
max.
6
GND
Power Supply
Ground (power supply)
7
GPIO6
CTS
(SPI CLK)
Input
Configuration pin for communication mode. 10K to 1.8V
for UART mode; leave open for SPI & host port I2C
modes.
SPI clock pin when module works in SPI mode
8
GPIO7
RTS
(SPI CS)
Input
Configuration pin for communication mode. 10K to GND
for host port I2C mode; leave open for SPI & UART
modes.
SPI chip select pin when module works in SPI mode
9
GND
Power Supply
Ground (power supply)
10
ANT_EXT
Antenna Input
Antenna signal / Z=50 Ohm (external active antenna in-
put)
11
VANT
Power supply
Power supply antenna – provide according voltage (up to
5.0 VDC) - VANT feeds Pin 8 ANT_EXT
12
ANT_SW
Input
Antenna switch (LOW or open = internal antenna, HIGH =
external antenna)
13
GPIO2
None
Leave open
14
Host Port
I2C_CLK
Input
Host port I2C clock pin when module works in host port
I2C mode
15
GPIO4
Input
External interrupt input pin – reserved for future use, leave
open
16
TM_GPIO5
Output
Time Mark – 1PPS signal
17
GPIO 1
I2C CLK
Input / Output
Configuration pin for the baud rate,2.2K to 1.8V for the
baud rate 4800 bps (see also“Configure the baud rate“).
I2C clock output to MEMS interface
18
GPIO 0
I2C DIO
Input / Output
Configuration pin for the baud rate,2.2K to 1.8V for the
baud rate 4800 bps (see also“Configure the baud rate“).
I2C I/O to MEMS interface
19
ON_OFF
Input
Connect to push-pull output! This is mandatory!
- Set to LOW by default
- Toggle to HIGH and back to LOW
> for first start-up after power on
> to request a fix in SiRFaware
TM
or PTF mode
> to go into or wake up out of hibernate mode
- Connect it to WAKEUP pin for self-start mode
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