User's Manual

Interface Locations and Pinouts
1322x Network Node Reference Manual, Rev. 1.1
Freescale Semiconductor 4-9
NOTE
The FLASH must first be cleared before loading a new image to FLASH.
The 1322x Network Node has two jumper sites (J19 and J20, Figure 4-5) that must be used to erase the
FLASH:
1. Short Jumper J3 Pin 1 to Pin 2 with a shorting bar.
2. Short Jumper J20 Pin 1 to Pin 2 with another shorting bar.
3. Turn on power, push the reset button, and wait a few seconds.
4. Turn off power.
5. Remove the jumper shorting bars.
6. The board is now ready for boot operation.
After the FLASH is erased, the module can be loaded with a new image through the USB port using Test
Tool. Refer to the
Test Tool User’s Guide as supplied with Test Tool in the BeeKit Wireless Connectivity
Toolkit download.
Figure 4-5. FLASH Erase Headers
4.11 ADC Voltage References
Two ADC reference voltages are provided:
• The reference voltage for ADC2_VREFH is tied to VCC which is regulated when the board is
supplied from the DC source or the USB port. However, this voltage moves with VCC when power
is supplied via the battery source.
• A fixed voltage reference for ADC1_VREFH is provided (see Figure 4-6).
— The fixed voltage is 1.5 Vdc.
— The LM285M (U17) is programmed via R120 and R121 to provide a constant reference
— The reference can be enabled via Jumper J18.
— This reference is useful for battery operation where a known, fixed high reference voltage for
the ADC is required.
ADC2_VREFH -> "0"
ADC2_VREFL -> "1"
Recover y Mode
1
2
J19
HDR_2X1
1
2
J20
HDR_2X1
R103
10K
TP103
C2
100nF
TP3
R104
10K
VCC
ADC2_VREFH
VCC
ADC2_VREFL