Information

32.11 Digital-to-analog converter block diagram
The following figure shows the block diagram of the DAC module. It contains a 64-tap
resistor ladder network and a 64-to-1 multiplexer, which selects an output voltage from
one of 64 distinct levels that outputs from DACO. It is controlled through the DAC
Control Register (DACCR). Its supply reference source can be selected from two sources
V
in1
and V
in2
. The module can be powered down or disabled when not in use. When in
Disabled mode, DACO is connected to the analog ground.
VOSEL[5:0]
DACO
MUX
MUX
DACEN
Vin
VRSEL
V
in1
V
in2
Figure 32-30. 6-bit DAC block diagram
32.12 DAC functional description
This section provides DAC functional description.
32.12.1 Voltage reference source select
• V
in1
must be used to connect to the primary voltage source as supply reference of 64
tap resistor ladder
• V
in2
must be used to connect to an alternate voltage source, or primary source, if an
alternate voltage source is not available
Chapter 32 Comparator (CMP)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 659