XC2269I Datasheet, PDF (92/134 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller

XC2269I
XC2000 Family Derivatives / Premium Line
Electrical Parameters
Sample time and conversion time of the XC2269I’s A/D converters are programmable.
The timing above can be calculated using Table 23.
The limit values for f_ADCI must not be exceeded when selecting the prescaler value.
Table 23 A/D Converter Computation Table
GLOBCTR.5-0 A/D Converter
INPCRx.7-0
Sample Time¹⁾
(DIVA)
Analog Clock f_ADCI
(STC)
t_S
000000_B
f_SYS
00_H
t_ADCI × 2
000001_B
f_SYS / 2
01_H
t_ADCI × 3
000010_B
f_SYS / 3
02_H
t_ADCI × 4
:
f_SYS / (DIVA+1)
:
t_ADCI × (STC+2)
111110_B
f_SYS / 63
FE_H
t_ADCI × 256
111111_B
f_SYS / 64
FF_H
t_ADCI × 257
1) The selected sample time is doubled if broken wire detection is active (due to the presampling phase).
Converter Timing Example A:
Assumptions: f_SYS
Analog clock
f_ADCI
Sample time
t_S
Conversion 12-bit:
t_C10
Conversion 10-bit:
t_C8
= 128 MHz (i.e. t_SYS = 7.8 ns), DIVA = 06_H, STC = 00_H
= f_SYS / 7 = 18.3 MHz, i.e. t_ADCI = 54.7 ns
= t_ADCI × 2 = 109.4 ns
= 16 × t_ADCI + 2 × t_SYS = 16 × 54.7 ns + 2 × 7.8 ns = 0.891 μs
= 12 × t_ADCI + 2 × t_SYS = 12 × 54.7 ns + 2 × 7.8 ns = 0.672 μs
Converter Timing Example B:
Assumptions: f_SYS
Analog clock
f_ADCI
Sample time
t_S
Conversion 12-bit:
t_C10
Conversion 10-bit:
t_C8
= 40 MHz (i.e. t_SYS = 25 ns), DIVA = 02_H, STC = 03_H
= f_SYS / 3 = 13.3 MHz, i.e. t_ADCI = 75 ns
= t_ADCI × 5 = 375 ns
= 19 × t_ADCI + 2 × t_SYS = 19 × 75 ns + 2 × 25 ns = 1.475 μs
= 15 × t_ADCI + 2 × t_SYS = 15 × 75 ns + 2 × 25 ns = 1.175 μs
Data Sheet
92
V1.3, 2014-07