pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 167

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
4.0 Embedded Controller Modules
After reading the data at the end of the cycle, the software may choose to set up new values for the input select control data
in order to measure different inputs during the following cycle. Another option is to use the old values for one or more voltage
channels and repeat the measurement on the previous inputs for a higher sampling rate. Any voltage output channel may
be disabled in order to skip its related measurement during the ADC cycle (shorter cycle).
ADC Control/Status Registers and Data Out Buffers. These may be read/written by the core through the Peripheral bus.
Timing Control. This block reduces the frequency of the system clock to the lower value required by the ADC.
4.11.3 Voltage Measurement
The ADC performs a linear conversion of the input voltage signal to an 8-bit, unsigned digital representation. The input signal
should be applied relative to the AGND pin and should range from 0V to V
Analog
Power
3.3V
AGND
AD0
AD9
AVCC
AVCC
VBAT
VDD
VCC
PC87591L-N05
Figure 59. ADC Functional Diagram
AI12
AI13
AI10
AI11
AI0
AI1
AI2
AI3
AI4
AI5
AI6
AI7
AI8
AI9
(Continued)
Analog
MUX
16:1
ADC
167
ADC Clock
Delay
A/D Converter
FS
(Full Scale).
VREF
Status and
Channel 1
Channel 2
Channel 3
Voltage
Voltage
Voltage
Control
Control
Timing
Peripheral Bus
Interrupt
System
Clock
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