User Manual
761
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
10-Bit Analog Digital Converter (ADC1)
24.5
Channel Controller
24.5.1
Functional Description
The task of each channel controller is a prioritization of the individual measurement channels. The
sequencing scheme is illustrated in the example of following table and can be programmed individually for
measurement unit.
The sequence registers SQ
n
define the time sequence of the measurement channels by the following rules:
• The sequence registers define the measurement sequence and are evaluated from register 1 to 12 and for
each register from MSB to LSB, which defines a max. overall measurement periodicity of 144 sampling and
conversion cycles.
• If the individual bit in the sequence register is set to ’1’, the corresponding channel is measured.
• If the individual bit in the sequence register is not set, this measurement phase is skipped.
In the upper example, the resulting channel sequence is defined as:
CH11, CH10, CH9, CH8, CH7, CH6, CH5, CH4, CH3,......, CH5, CH4, CH3, CH2, CH11, CH11
In TLE984xQX Channels 0 - 11 can be fully programmed. The channels 0-11 are measured depending on the
amount of ’1’ bits, written in the sequence registers. The following equations can be used to calculate the
periodicity of the required channel measurement.
The overall measurement periodicity of all measurements in A/D conversion cycles is defined as:
(24.1)
Table 412 Measurement channel sequence definition example (used as default sequence)
Measurement channel n
MSB
CH1
1
CH1
0
CH9 CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 LSB
CH0
Registers SQ_
0_1
[11:0]
1
1
1
1
1
1
1
1
1
1
1
1
Registers SQ_
0_1
[27:16]
0
0
0
0
0
0
1
1
1
1
0
0
Registers SQ_
2_3
[11:0]
1
0
0
0
0
0
0
0
0
0
0
0
Registers SQ_
2_3
[27:16]
1
1
1
1
1
1
1
1
1
1
1
1
Registers SQ_
4_5
[11:0]
0
0
0
0
0
0
0
0
0
0
0
0
Registers SQ_
4_5
[27:16]
0
0
0
0
0
0
0
0
0
0
0
0
Registers SQ_
6_7
[11:0]
1
1
1
1
1
1
1
1
1
1
1
1
Registers SQ_
6_7
[27:16]
0
0
0
0
0
0
0
0
0
0
0
0
Registers SQ_
8_9
[11:0]
0
0
0
0
0
0
0
0
0
0
0
0
Registers SQ
_8_9
[27:16]
1
1
1
1
1
1
1
1
1
1
1
1
Registers SQ_
10_11
[11:0]
0
0
0
0
0
0
0
0
0
0
0
0
Registers SQ_
10_11
[27:16]
0
0
0
0
0
0
0
0
0
0
0
0
[ ]
⎟
⎠
⎞
⎜
⎝
⎛
∑
=
11
0
n
m
n
SQ
∑
=
12
1
m
N
meas
=