# adh8066 strange reset

**URL:** <https://community.sparkfun.com/t/adh8066-strange-reset/19988>\
**Category:** Wireless & IoT\
**Created:** [March 20, 2011, 1:18am UTC](https://community.sparkfun.com/t/adh8066-strange-reset/19988 "2011-03-20T01:18:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![swinchen](https://avatars.discourse-cdn.com/v4/letter/s/ac8455/32.png) [@swinchen](https://community.sparkfun.com/u/swinchen)\
**Post date:** [March 20, 2011, 1:18am UTC](https://community.sparkfun.com/t/adh8066-strange-reset/19988/1 "2011-03-20T01:18:18Z")

</div>

Hi all,

I am using the ADH8066 Eval board and Module along with the 5V 1A Wall adapter that SF sells.

When I do not have a SIM card inserted into the module it behaves as expected. Not many of the AT commands work, but I can check signal strength and do a few other small things…

When I insert the sim card it seems to work fine for a moment (I have about enough time for AT+CPIN?) but then it spits out a bunch of what appears to be debugging information and resets.

```auto
àààü€IIIIw
Ready
AT+CPIN?
+CPIN: READY

OK
CPSR=80000097,LR=00156b80,SP=2001c838,SPSR=0000003f,SLR=00156c09,SSP=0100dcd0,LR
FromPreviousMode=deaddead,r0=00156b80,r1=00000700,r2=0100328c,r3=0000000c,r4=010
0328c,r5=01000c7c,r6=0000000d,r7=00000709,IER=7ffb,PIR=0000,ICR=73ff,IMR=00,IID_
FIQ=0b,IID_IRQ=04
interrupt priority level:
EXT2/EXT3=1, EXT1=1, ONOFFSTAT=1, KBS=1,
TIM_INT=1, UART1_STAT=1, UART1_TX=1, UART1_RX=4,
UART0_STAT=1, UART0_TX=1, UART0_RX=4, SIM_STAT=5,
IIC_STAT=1, DSP_REQ=2, FRAME=3, NMI=7
type=01; v_ModuleNumber=3d, v_FileNumber=01, v_ProcedureNumber=00, v_LocalErrorC
ode=17, v_din_NbGeneralDefense=00

```

I hit enter after the OK returned from the CPIN query.

Perhaps the 5V 1A supply isn’t adequate? I also tried a 12V 1.5A supply I had kicking around… same error. 😕

Any ideas what could be causing this? thanks.

Sam