User's Manual

page 22/51
HiAll
NC
User Manual 2012/06/28
o Use external resistor divider to limit the ADC input voltage when measured a voltage higher
than VANA.
o Do not connect the UART lines (TXD, RXD, RTS, CTS) to any other voltage.
• To avoid any current re-injection on VGPIO (2.80V),
o Do not connect a power supply to the VGPIO pad. This pad is an LDO output only.
o The host must supply all the GPIOs connected to HiAll
NC
with correct voltage in compliance with
the power domain, and must shut off the GPIOs when the module is off.
o The SPI bus must not connect to the external system.
o The JTAG bus must not connect to the external system.
• To avoid any current re-injection on VPERM (3.0V)
o The POK_IN signal is internally pulled up and can be connected to an open drain transistor.
• To avoid any current re-injection on VBACKUP (3.0V)
o The VBACKUP signal must be only connected to a DC coin 3V battery or a capacitor.
• To avoid any current re-injection on SIM_VCC (1.8V or 2.9V)
o Use only SIM_VCC pads to supply the SIM card or SIM IC.
• To avoid any current re-injection on VBAT (3.3V to 4.5V)
o Decrease the rising time (recommended value <1ms ) as much as possible for VBAT.
o Use serial capacitor (10µF) to isolate the audio speaker lines to the external system if
necessary.
3.5 UARTS
HiAll
NC
module has a main UART port that can be used in low-speed, full-speed, and high-speed modes. The
UART communicates with serial data ports conforming to the RS-232 interface protocol. With a properly written
and user-defined download program, the UART port can be used for testing and debugging.
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Provision of external access to the V24 interface for easy upgrade of software is recommended.
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Baud rate up to 1Mbps
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Unused signals can be left unconnected.
Signal name (DCE side)
Signal name (DTE side) Signal use (DTE side)
UART1_DTR
DTE_DSR Signal UART interface is ON
UART1_DCD
DTE_DCD Signal data connection in progress
UART1_RXD
DTE_TXD Transmit data
UART1_RTS
DTE_CTS HiAllNC is ready to receive AT commands
UART1_TXD
DTE_RXD Receive data
UART1_CTS
DTE_RTS
Wakes up the module when Ksleep=1 is
used
UART1_RI
DTE_RI
Signal incoming calls (voice and data),
SMS, etc.
UART1_DSR
DTE_DTR
Prevents the HiAllNC from entering sleep
mode
Switches between data mode and
command mode
Wakes the module up.