User's Manual Part 1

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Table 8 X-GOLD™ Baseband to GNSS Interface Signals
Signal Description
VBAT Battery Supply
1.8V 1.8 V Supply provided from X-GOLD™ Baseband
UART The data and control I/F between the X-GOLD™ baseband and the GNSS
device is over a 4 wire UART interface which include CTS/RTS handshaking.
PDB X-GOLD™ baseband uses this signal to control Power-on/reset of the GNSS
device
LPO_CLK X-
GOLD™ baseband provides a permanently active 32 kHz clock to the GNSS
device
EXT_REF_CLK X-GOLD™ baseband provides a 26 MHz clock to the GNSS device for
frequency aiding.
EXT_DUT_CLK X-GOLD™ baseband provides this signal to notify the GNSS device of that
GSM Tx activity (PA Blanking)
EXT_FRM_SYNC X-GOLD™ baseband provides a strobe signal to the
GNSS device to allow fine
time assistance based on 3GPP cell timing.
The GNSS signals available to the host at the WWAN module interface to support
GNSS operation are shown in
Table 9
.
Table 9
GNSS Module Interface Signals
Signal Name Description Pin Direction
(WWAN)
Voltage
Level
I2C_SCL I2C Clock 40 I, O 1.8 V
I2C_SDA I2C Data 42 I, O 1.8 V
I2C_IRQ I2C IRQ - Interrupt signal 44 I 1.8 V
SYSCLK Synchronization Clock 46 I 1.8 V
TX_BLANKING TX Blanking – Active High when M.2 is
transmitting.
48 O 1.8 V
GNSS_DISABLE#
GNSS Disable
High: GNSS function is determine by AT
command.
Low: GNSS function is disabled.
GNSS_DISABLE# pin has a pull-up resistor
on the WWAN M.2 module
26 I 1.8 V
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The system control interface is used to control the power-up and reset of the WWAN
module. There are additional control signals to disable the radio, drive an LED as a status
indicator, an output to wake the host processor, and an input for body SAR.