User`s guide
Intel
®
StrongARM
®
SA-1110 Microprocessor Development Board
User’s Guide
5-1
Analog I/O
5
The SA-1110 Development Board has several analog I/O systems in addition to the audio systems.
The non-audio analog IO functions include the following:
• Battery temperature
• Battery voltage
• Charger voltage
• Spare analog input
• Touch screen
5.1 UCB1300 Analog IO
The UCB1300 supports four general-purpose analog inputs to the same ten-bit analog to digital
converter that support the touch screen. The inputs are high level inputs with 8 V DC required for a
full-scale reading. With the ten-bit ADC this means that the analog resolution is approximately
8 mV. Low level signals such as TEMP (main battery temperature) may have limited resolution. In
the SA-1110 Development Board, the four analog input channels are assigned as follows:
Table 5-1. ADC Input Pin Descriptions
5.1.1 Battery Voltage
The SA-1110 Development Board battery voltage is monitored by one of the UCB1300 analog
inputs. The UCB1300 ADC device is accurate to about 10%.
ADC
Input
Name Description/use
0 V_PWR_IN
Charger input voltage—This voltage must be monitored to determine the presence of
a battery charger voltage.
1VBATT
Main battery terminal voltage—May be used by battery management software to
monitor battery voltage.
2TEMP
Main battery temperature—Temperature sensor input used to monitor battery
temperature.
3 SPARE Analog Spare Input—User definable inputs.