Billion Electric Co. Ltd. BIL-SIM7100C Benutzerhandbuch
Smart Machine Smart Decision
SIM7100C_User Manual_V1.01
2015-09-19
38
and 16 bits (linear).
Note: PCM interface is multiplexed from GPIO (default setting). The AT command “AT+CPCM” is
used to switch between PCM and GPIO functions. Please refer to document [21] and document [1] for
details.
used to switch between PCM and GPIO functions. Please refer to document [21] and document [1] for
details.
3.6.1
PCM Pin Description
Table 18: PCM Pin description
Pins
Pin No.
Description
PCM_OUT
73
PCM data output
PCM_IN
74
PCM data input
PCM_SYNC
75
PCM data synchrony
PCM_CLK
76
PCM data clock
Table 19: PCM Electronic characteristic
Symbol
Parameter
Min
Typ
Max
Unit
V
IH
High-level input voltage
1.26
1.8
2.1
V
V
IL
Low-level input voltage
-0.3
0
0.63
V
V
OH
High-level output voltage
1.35
-
1.8
V
V
OL
Low-level output voltage
0
0
0.45
V
3.6.2
PCM Signal Description
The default PCM interface in SIM7100C is the auxiliary PCM interface. The data changes on the high
level of PCM_CLK and is sampled at the falling edge of PCM_CLK in one period. Primary PCM is
disabled after every power-on or every reset event. So user must use AT command to enable the primary
PCM mode after powering on or resetting the module every time if user wants to use Primary
PCM.SIM7100C PCM Interface can be operated in Master or Slave mode if it is configured to primary
PCM. In Master Mode, the Module drives the clock and sync signals that are sent to the external codec.
When it is in Slave Mode, the external codec drives the clock and sync signals which are sent to the
module. Both PCM modes are discussed in this section followed by additional PCM topics.
level of PCM_CLK and is sampled at the falling edge of PCM_CLK in one period. Primary PCM is
disabled after every power-on or every reset event. So user must use AT command to enable the primary
PCM mode after powering on or resetting the module every time if user wants to use Primary
PCM.SIM7100C PCM Interface can be operated in Master or Slave mode if it is configured to primary
PCM. In Master Mode, the Module drives the clock and sync signals that are sent to the external codec.
When it is in Slave Mode, the external codec drives the clock and sync signals which are sent to the
module. Both PCM modes are discussed in this section followed by additional PCM topics.
3.6.3
Auxiliary PCM (128 KHz PCM clock)
-law coding is supported by the auxiliary PCM. The auxiliary codec port operates with standard