Rev 6.0
26
User Guide
Features Configuration and Limitations
4.1.13. Power ON Signal
The HL6 and HL8 modules have an active low power ON signal pin, while Q26 modules have an
active high power ON signal. An inverter is added to the Q26 Carrier Board to reverse the polarity of
the signal.
4.1.14. Reset Signal
When using the Q26 Carrier Board, a low level pulse must be sent on the reset pin for 10 ms. This
action will immediately restart the AirPrime HL6 or HL8 module with the PWR_ON_N signal at low
level.
4.1.15. BOOT Signal
Because the BOOT pin is connected to VCC_1V8 in the Q268xx (the Q2698 does not have a BOOT
pin), and set to active low, the BOOT signal has to be reversed when using the Q26 Carrier Board.
4.1.16. ADC
Two Analog to Digital converter inputs, ADC1/BAT-TEMP and ADC2 are available when using the
Q26 Carrier Board. These converters are 10-bit resolution ADCs with voltage range shown in the
table below.
Table 11.
ADC Voltage Range
Condition
Q268xx
Q2698
Q26 Carrier Board with
HL6528, HL6528RD
Q26 Carrier Board
with HL8548
ADC1/BAT-TEMP
0
– 2 V
0
– 4 V
0
– 3 V (TBC)
0
– 1.2 V (TBC)
ADC2
0
– 2 V
0
– 4 V
0
– 3 V (TBC)
0
– 1.2 V (TBC)
Because the HL8548 voltage range is narrower than the Q26 input range, if an HL8548 module is
used in the Q26 Carrier Board and receives an input voltage of more than 1.2 V, the ADC port might
be damaged. To protect the Q26 Carrier Board from overvoltage input, additional circuitry has been
added to the carrier board.
Similarly, the HL6528 and HL6528RD voltage range is also narrower than the Q2698 input range and
additional circuitry on the Q26 Carrier Board protects it from overvoltage when migrating from an
application that uses a Q2698.
However, if the existing application uses a Q268xx module, using an HL6528 or HL6528RD module
with the Q26 Carrier Board might not provide enough resolution as the voltage range of the HL6 is
wider than that of the Q268xx.
