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7
25A1090 (Rev.3)
DIGITAL SECTION
ACCESSING DIFFERENT MODES
ATE MODE
If TP_PB0 is held to TP_EGND, or logic level 0, at startup, the microcontroller will enter ATE
Mode. To ensure proper operation, TP_PA0 and TP_PA1 should be held to TP_EGND at startup.
In ATE Mode, each band has a three test frequencies that are controlled by the logic levels at
test points TP_PA0 and TP_PA1.
RF BAND RESISTORS
Two resistors (R
A
and R
B
) are responsible to start the microcontroller in a RF band. They de-
termine the voltage at test point TP_RFBAND.
This table shows R
A
's and R
B
's reference designators and how the voltages at the test points
reflect the operating RF band.
This figure depicts the voltage divider feeding the microprocessor analog to digital converter.
.
Frequency
TP_PA0 TP_PA1
Low
0
0
Center
0
1
High
1
1
Test Frequencies (MHz)
H5
J3
JB
L4
P4
Q4
R5
S6
SLX2
Low
518.400
572.400
806.125
638.400
702.100
740.125
800.525
838.100
Center
529.500
583.500
807.500
649.500
714.000
746.325
810.275
851.300
High
541.800
595.800
809.750
661.800
725.900
751.875
819.800
864.800
SLX Reference Designators
SLX2
R
A
R
B
R319
R320