Embedded Planet CHRONOS User Manual page 11

Pin # Pin Name
15 DTR
16 GND
17 SPI_CS
18 SPI_MOSI
19 SPI_MISO
20 SPI_CLK
21 GND
22 CELL_LED
23 CTS
24 PWR_MON
25 Vcell_ref
26 RTS
27 TX_AUX
28 RX_AUX
29 DAC
30 RING
31 ON_OFF#
32 CTS1
33 RTS1
34 IO2
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Pin Type Description
Digital input Main UART DTR
input to cell module
n/a GND
Digital I/O Standard 3-wire SPI
master or slave with
Digital I/O
chip select control
Digital I/O
Digital I/O
n/a GND
Digital output Cell module status
LED
Digital output Main UART CTS
output from cell
module
Digital output Cell module power
monitor
Power input Reference voltage
for host GPIO
Digital input Main UART RTS
input to cell module
Digital output Aux UART output
from cell module
Digital input Aux UART input to
cell module
Analog output
Digital output Output from cell
module indicating
incoming call
Open collector input Input command for
power ON/OFF and
to wake from deep
sleep mode
Digital output UART1
Digital input UART1
Digital I/O GPIO
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User Manual | Chronos
If not used
Leave open
Must be
implemented
Leave open
Leave open
Leave open
Leave open
Must be
implemented
Leave open
Leave open
Leave open
Leave open
Leave open
Leave open
Leave open
Leave open
Leave open
Tie to GND
(see note
below)
Leave open
Leave open
Leave open
Notes
If not used as
DTR, this pin
can be used as
a GPIO
Refer to Telit
documentation
High when cell
module is ON
Refer to Telit
documentation
If not used as
RING, this pin
can be used as
a GPIO
Active Low
Internal 100k
pullup
page 10