Rev 6.0
27
User Guide
Features Configuration and Limitations
4.1.17. BAT_RTC
As shown in the table below, the voltage range varies between Q26 modules, and the HL6 and HL8
modules. Additional circuitry has been added on the Q26 Carrier Board to protect it from overvoltage
input.
Table 12.
BAT_RTC
Parameter
Q26
Q26 Carrier Board with
HL6528, HL6528RD
Q26 Carrier Board with
HL8548
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Input Voltage
1.85 V
-
3 V
-
3 V
-
1.0 V
1.8 V
1.9 V
Input current
consumption
3.0 µA
3.3 µA
3.6 µA
-
2.5 µA
-
-
1 µA
-
Output Voltage
2.40 V
2.45 V
2.50 V
2.82 V
3.0 V
3.18 V
1.71 V
1.8 V
1.89 V
Output current
-
-
2 mA
-
0.6 mA
-
-
25 mA
-
Note:
The HL6528 and HL6528RD output is higher than the Q26.
The HL8548 output is only 1.8 V (typical) which might not be enough to charge the application’s
battery.
4.1.18. Debug Port
HL6 and HL8 embedded modules support a software trace interface that provides real-time instruction
and data trace of the modem core.
The following table provides the pin mapping of the debug port between the Q26 Carrier Board and
the HL6 and HL8 embedded modules.
Table 13.
Debug Port
Q26
Q26 Carrier Board with
HL6528, HL6528RD
Q26 Carrier Board with
HL8548
Pin #
Signal Name
Signal Name
Signal Name
53
GPIO2
SPI1_MRDY
DEBUG_RX
55
GPIO23
SPI1_CLK
57
GPIO22
SPI1_MISO
58
GPIO24
SPI1_MOSI
In addition to the pins specified in the table above, the Q26 Carrier Board also has a test pad, TP278,
which corresponds to pin 44 of the HL6 and HL8 module (SPI1_SRDY on the HL6528 and
HL6528RD, DEBUG_TX on the HL8548) which is also used for debug.
