SIM5218E Hardware Design
Cold start <40s
Receiver Type 12-channel, GPS L1 Frequency (1575.42MHz), C/A Code
Update rate
Default 1 Hz
GPS data format NMEA-0183
Power consumption 80mA (Total supply current at VBAT pin)
GPS antenna Passive and active antenna
Active antenna voltage 2.7V
Note: Performance will vary depending on the environment, antenna type and signal conditions
and so on.
3.18.4 GPS operate
GPS is close default, it could be started by AT+CGPS. The AT command has two parameters, the
first is on/off, and the second is GPS mode. Default mode is standalone mode.
Note: 1
、
AGPS mode needs more supporting from the mobile telecommunication network. And
the detail of AGPS can refer AGPS application from SIMCOM Ltd.
2
、
About the detail of AT Command please refer to the document
“SIMCOM_SIM5218_ATC_EN”.
3.19 PCM Interface
SIM5218E provides hardware PCM interface for external codec. PCM interface pins are multiplex
on GPIOs(default setting). Use AT+CPCM command to change pins function between PCM
function and GPIOs.If enbale PCM function ,AT+CPCM command can be used to configure the
PCM mode user want. Also the slot of PCM can be configured by AT+CPCMSLOT.
SIM5218E PCM interface can be used in two modes:
1) the default mode is its auxiliary PCM (8 kHz long sync mode at 128kHz clk)
，
and uses a
62.5
μ
s sync pulse (half a time frame);
2) the other mode is its primary PCM (8 kHz short sync mode at 2048 kHz clk)
，
and uses
488 ns sync pulse (one 2.048 MHz clock tick).
In short-sync (primary PCM) mode, the SIM5218E can be a master or a slave. In long-sync
(auxiliary PCM) mode, the SIM5218E is always a master; there is no slave support.
SIM5218E support 3 PCM formats: 8 bits (
υ
-law or A-law) and 16 bits (linear).
PCM
mode
SYNC
CLK
MODE
Format
Slot
Auxiliary
8KHz
128KHz
Master
Only slot 0
Primary
8KHz
2.048MHz
Slave/Master
A-law(8 bits)
υ
-law(8bits)
linear(16 bits)
0~15(Changed by
AT command
：
at+cpcmslot)
Default
：
slot 0
The PCM interface is a 4 pin, digital interface that enables PCM communication between the
SIM5218E_ Hardware Design_V1.06
2012.09.21
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