参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 9/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
6-63
On-Chip Peripheral Components
C515
DAPR.3-.0 is the contents of the low-order nibble, and DAPR.7-.4 the contents of the high-order
nibble of DAPR.
If DAPR.3-.0 or DAPR.7-.4 = 0, the internal reference voltages correspond to the external reference
voltages
V
AGND and VAREF, respectively.
If
V
AINPUT > VIntAREF, the conversion result is FF
H, if VAINPUT < VIntAGDN , the conversion result is 00H
(
V
AINPUT is the analog input voltage). If the external reference voltages VAGND = 0 V and VAREF = +5 V
(with respect to
V
SS and VCC) are applied, then the following internal reference voltages VIntAGND and
V
IntAREF shown in table 6-6 can be adjusted via the special function register DAPR.
Table 6-6
Adjustable Internal Reference Voltages
The programmability of the internal reference voltages allows adjusting the internal voltage range
to the range of the external analog input voltage or it may be used to increase the resolution of the
converted analog input voltage by starting a second conversion with a compressed internal
reference voltage range close to the previously measured analog value. Figures 7-30 and 7-31
illustrate these applications.
Step
DAPR (.3-.0)
DAPR (.7-.4)
V
IntAGND
V
IntAREF
0
0000
0.0
5.0
1
0001
0.3125
2
0010
0.625
3
0011
0.9375
4
0100
1.25
5
0101
1.5625
6
0110
1.875
7
0111
2.1875
8
1000
2.5
9
1001
2.8125
10
1010
3.125
11
1011
3.4375
12
1100
3.75
13
1101
4.0625
14
1110
4.375
15
1111
4.68754
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