AZPB70 Datasheet, PDF (12/15 Pages) Arizona Microtek, Inc – Programmer Board Kit for AZT70/71

Arizona Microtek, Inc.
AZPB70
Programmer Board for AZT70/71
For an example of writing bits into the EEPROM, suppose the desired capacitance is 3.43pF (AZT70). The control word
becomes ‘00000010100’ (Figure 14). Also suppose the EEPROM bits have been erased and therefore logic high (The
AZT70/71 is initially shipped in this condition). Since bit0 is the first bit to be loaded, the bit sequence becomes 0-0-1-0-
1-0-0-0-0-0-0. However, as described before, selecting bits for the EEPROM are active LOW, which will invert the
logical values in the sequence to 1-1-0-1-0-1-1-1-1-1-1 (Figure 15). Note the differences between the EEPROM bits and
the converted control word. Since there are 2 differences, two write cycles are required as only 1 bit should be written at a
time. Figure 15 shows the timing for bit2 while Figure 16 shows the timing for bit4. Note that all the just described
operations are internally performed through the included software and programmer board detailed previously.
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9 bit 10
Figure 14 – Desired control word
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9 bit 10
DA
difference
difference
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9 bit 10
EEPROM
Figure 15 – Converted control word and differences from known EEPROM states
bit 0
bit 1
DA
bit 0
loaded 1^st
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9 bit 10
bit 10
loaded last
CLK
PV
10ms
min
4µs
min
≥5.6V,
≤6.1V
t
Figure 16 – First programming cycle to program bit2 into the EEPROM
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May 2012, Rev 1.2