- Wed May 14, 2008 6:58 pm
#48257
Hey Guys,
I'm using a GM862 Quad and I bought a 50 pin breakout board for it. I have connected
the three GND pins to ground and the four VBATT pins to 3.8V. The 3.8 V is provided by
the LT1528 regulator. RXD, TXD lines are connected to T1IN, R1OUT lines respectively of a Max232 which is powered using 2.8V.
The PWRMON signal is connected to an LED in series with a 560 Ohms resistor which goes to ground, and the STAT_LED pin of the GM862 is connected to the -ve side of an LED which is connected in series with a 220 Ohms resistor which is in turn connected to 3.8V.
RST is connected to ground and ON/OFF to a debounced switch which ties the ON/OFF pin to ground when pressed.
Problem is the PWRMON LED doesn't turn on when I apply power to the circuit. Consequently, the status LED doesn't blink.
In fact, I expected that if I test the ON/OFF signal with an oscilloscope, it would be at around 3.8V when the switch isn't pressed down but that's not the case.
Could there be something that I could be doing wrong? By the way, is connecting VBATT to 3.8V and GND to ground enough for the module to power on (i.e for the PWRMON pin to go high).
This is very urgent guys. I would really appreciate anyone's help.
Thanks alot,
Molex
I'm using a GM862 Quad and I bought a 50 pin breakout board for it. I have connected
the three GND pins to ground and the four VBATT pins to 3.8V. The 3.8 V is provided by
the LT1528 regulator. RXD, TXD lines are connected to T1IN, R1OUT lines respectively of a Max232 which is powered using 2.8V.
The PWRMON signal is connected to an LED in series with a 560 Ohms resistor which goes to ground, and the STAT_LED pin of the GM862 is connected to the -ve side of an LED which is connected in series with a 220 Ohms resistor which is in turn connected to 3.8V.
RST is connected to ground and ON/OFF to a debounced switch which ties the ON/OFF pin to ground when pressed.
Problem is the PWRMON LED doesn't turn on when I apply power to the circuit. Consequently, the status LED doesn't blink.
In fact, I expected that if I test the ON/OFF signal with an oscilloscope, it would be at around 3.8V when the switch isn't pressed down but that's not the case.
Could there be something that I could be doing wrong? By the way, is connecting VBATT to 3.8V and GND to ground enough for the module to power on (i.e for the PWRMON pin to go high).
This is very urgent guys. I would really appreciate anyone's help.
Thanks alot,
Molex