Signal name I/O Function
REF_CLK I Reference Clock = RF Cellular clock, Min 0.2V
pk-pk
GPS_CLK I Connection of 16.368MHz GPS TCXO
RTC_CLK I Cellular engine 32768 Hz sleep clock
Control
GPS_EN_RESET I GPS engine reset
AGPS_CLK_REQ O MCU Interrupt when GPS requires CE to be awake
(Host Wakeup)
IO_TIMESTAMP_DATAR
DY
I Strobe for accurately marking in real time,
timing information from the cellular engine.
DATARDY indication to download code through
synchronous operation from cellular engine.
IO_PA_EN I Used to implement PA blanking when cellular PA
is ON
Comms
I2C_SCL_U1TX B I2C clk line
I2C_SDA_U1RX B I2C data line
Power
VDDS P Cellular engine I/O supply
VBatt 1 & 3 P Phone battery power or SMPS power
VBatt 2 P Phone battery power
VSS P Ground plane
WLAN module
WLAN module HW53 supports WLANSize4.0 release. WLAN module is configured as Cellular engine SPI slave.
WLAN and Bluetooth co-existence is supported via BTH-WLAN interface. WLANSize4.0 has a reference clock
of external oscillator 38.4MHz and it is shared with BTHFMRDS2.3
Figure 66 WLAN module
FM transmitter module
The FM transmitter module Si4713 is controlled by I2C from RAPIDO with left and right analog audio input
from the DAC33.
RM-505; RM-506
System Module and User Interface
Page 8 –18 COMPANY CONFIDENTIAL Issue 1
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