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XC2288H_11 Datasheet, PDF (107/151 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance
XC2288H, XC2289H
XC2000 Family / High Line
Electrical Parameters
Sample time and conversion time of the XC228xH’s A/D converters are programmable.
The timing above can be calculated using Table 21.
The limit values for fADCI must not be exceeded when selecting the prescaler value.
Table 21 A/D Converter Computation Table
GLOBCTR.5-0 A/D Converter
INPCRx.7-0
Sample Time1)
(DIVA)
Analog Clock fADCI
(STC)
tS
000000B
fSYS
00H
tADCI × 2
000001B
fSYS / 2
01H
tADCI × 3
000010B
fSYS / 3
02H
tADCI × 4
:
fSYS / (DIVA+1)
:
tADCI × (STC+2)
111110B
fSYS / 63
FEH
tADCI × 256
111111B
fSYS / 64
FFH
tADCI × 257
1) The selected sample time is doubled if broken wire detection is active (due to the presampling phase).
Converter Timing Example A:
Assumptions: fSYS
Analog clock
fADCI
Sample time
tS
Conversion 10-bit:
tC10
Conversion 8-bit:
tC8
= 100 MHz (i.e. tSYS = 10 ns), DIVA = 03H, STC = 00H
= fSYS / 4 = 25 MHz, i.e. tADCI = 40 ns
= tADCI × 2 = 80 ns
= 13 × tADCI + 2 × tSYS = 13 × 40 ns + 2 × 10ns = 0.540 μs
= 11 × tADCI + 2 × tSYS = 11 × 40 ns + 2 × 10 ns = 0.460 μs
Converter Timing Example B:
Assumptions: fSYS
Analog clock
fADCI
Sample time
tS
Conversion 10-bit:
tC10
Conversion 8-bit:
tC8
= 40 MHz (i.e. tSYS = 25 ns), DIVA = 02H, STC = 03H
= fSYS / 3 = 13.3 MHz, i.e. tADCI = 75 ns
= tADCI × 5 = 375 ns
= 16 × tADCI + 2 × tSYS = 16 × 75 ns + 2 × 25 ns = 1.25 μs
= 14 × tADCI + 2 × tSYS = 14 × 75 ns + 2 × 25 ns = 1.10 μs
Data Sheet
107
V1.3, 2011-07