Table of Contents
Advertisement
This peripheral is available in LPC2132/4/6/8 devices.
17.1 Features
17.2 Pin description
Table 166
Table 166: DAC pin description
Pin
AOUT
V
V
17.3 DAC Register (DACR - 0xE006 C000)
This read/write register includes the digital value to be converted to analog, and a bit that
trades off performance vs. power. Bits 5:0 are reserved for future, higher-resolution D/A
converters.
Table 167: DAC Register (DACR - address 0xE006 C000) bit description
Bit
5:0
15:6
16
31:17 -
User manual
UM10120
Chapter 17: Digital-to-Analog Converter (DAC)
Rev. 01 — 24 June 2005
•
10 bit digital to analog converter
•
Resistor string architecture
•
Buffered output
•
Power-down mode
•
Selectable speed vs. power
gives a brief summary of each of DAC related pins.
Type
Output
Reference
REF
, V
Power
DDA
SSA
Symbol Value
Description
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
VALUE
After the selected settling time after this field is written with a
new VALUE, the voltage on the A
is VALUE/1024 * V
The settling time of the DAC is 1 µs max, and the maximum
BIAS
0
current is 700 υA.
The settling time of the DAC is 2.5 µs and the maximum
1
current is 350 µA.
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
Rev. 01 — 24 June 2005
Description
Analog Output. After the selected settling time after the DACR is
written with a new value, the voltage on this pin (with respect to
V
) is VALUE/1024 * V
SSA
REF
Voltage Reference. This pin provides a voltage reference level for
the D/A converter.
Analog Power and Ground. These should be nominally the same
voltages as V
and V
, but should be isolated to minimize noise
3
SSD
and error.
.
REF
User manual
.
pin (with respect to V
OUT
SSA
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Reset
value
NA
0
)
0
NA
198
Advertisement
Table of Contents
