Using the Memory Address Map
DAI12-4(FIT)GY
49
Basic Output Data Area
The basic output data area, which is a 128-byte (80h) area beginning with address
305000h, corresponds to a given Device ID.
The starting address can be determined according to the following expression:
Starting address = 3 80h x (Device ID)
Table 5.4. Basic Output Data Area
Address (h)
Area
Item
Size
Access type
Starting 00
- Starting 01
CH0
Analog output value
2
R/W
Starting 02
- Starting 03
CH1
Analog output value
2
R/W
Starting 04
- Starting 05
CH2
Analog output value
2
R/W
Starting 06
- Starting 07
CH3
Analog output value
2
R/W
Starting 08
- Starting 7F
Reserved
120
R
- Analog output value
Analog output values are stored as Little Endians.
Table 5.5. Analog Output Value
D7
D6
D5
D4
D3
D2
D1
D0
+00h
A7
A6
A5
A4
A3
A2
A1
A0
+01h
0
0
0
0
A11 A10
A9
A8
The D/A conversion is performed on a channel-by-channel basis, with a timing that
writes analog output values; the results are stored two bytes at a time. For this reason
although there is data compatibility between the high and low bytes, there is no
synchronization between channels.
Conversion formula:
analog output value = (output voltage (V) + offset) × 2
12
/ span
analog output value = (output current (mA) + offset) × 2
12
/ span