User's Manual

page 31/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
Document Sagemcom Reproduction et divulgation interdites
Sagemcom document. Reproduction and disclosure prohibited
HiLoNC
Pads
Signal Name Function Power domain
E26 /GPIO3 GPIO 2.8V
E27 GND RF 0V
E28 /ANTENNA RF 3.7V
E29 GND RF 0V
E30 VBATT POWER 3.7V
E31 VBATT POWER 3.7V
E32 /UART0_TXD UART 0 2.85V
E33 /UART1_DSR UART 1 2.8V
E34 /UART1_DCD UART 1 2.8V
E35 /UART1_RI UART 1 2.8V
E36 /UART1_DTR UART 1 2.8V
E37 /UART1_RTS UART 1 2.85V
E38 /UART1_RX UART 1 2.85V
E39 /UART1_TX UART 1 2.85V
E40 /UART1_CTS UART 1 2.85V
E41 /POK_IN POWER ON 3.0V
E42 /PWM2 PWM 2.85V
E43 /PWM1 PWM 2.85V
E44 /SIM_CLK SIM 1.8V or 2.9V
E45 /SIM_RST SIM 1.8V or 2.9V
E46 /SIM_DATA SIM 1.8V or 2.9V
E47 VSIM SIM 1.8V or 2.9V
E48 VBATT POWER 3.7V
E49 GND POWER 0V
E50 /HSET_OUT_P AUDIO 3.7V
E51 /HSET_OUT_N AUDIO 3.7V
Figure 31 : HiLoNC V2 51 pads with their power domains…continued
4.14.2 IO DC PRESENCE BEFORE POWER ON.
When the VBAT is available but the module not yet started, the following I/O's raised their output.
• VBACKUP raise to 3V
• POK_IN raise to 3V
• HSET_N raise to 1.4V
• HSET_P raise to 1.4V
4.14.3 SIDE EFFECTS OF A RETRO SUPPLY (CURRENT RE-INJECTION)
Interactions or connections between the HiLoNC V2 module and the external systems can lead to retro power
supply side effects, or current re-injection through pads while the module is not yet fully powered up (means
VBAT lower than its minimum 3.2V).
If some precaution and simple rules are not followed, those effects can in worst case result in a deadlock
module, not able to start up or to communicate.
Deadlock could happen if the retro supply occurs before the module start. The flow back current could in the
worst case prevent the module to start.
The very same behaviour can happen in a normal use conditions when the lines connecting to the module to the
external system uses a non compliant voltage higher than the module IO power domain (2.85V). This results in
a current flow back inside the module and can lead to a deadlock system on the next start if this retro supply
has continued while the system was powered off or under powered (under 3.2V).
An over voltage on any line can also damage the HiLoNC V2 module.
Those consequences are very rare but exist. Therefore, the rules and advises given on every chapter of this
application note must be followed.