Table 92. Analog Watchdog 1 Comparison; Table 93. Analog Watchdog 2 And 3 Comparison - STMicroelectronics RM0365 Reference Manual

RM0365
These thresholds are programmed in bits HT1[11:0] and LT1[11:0] of the ADCx_TR1
register for the analog watchdog 1. When converting data with a resolution of less than 12
bits (according to bits RES[1:0]), the LSB of the programmed thresholds must be kept
cleared because the internal comparison is always performed on the full 12-bit raw
converted data (left aligned).
Table 92
analog watchdog 1.
Resolution
(bit
RES[1:0])
00: 12-bit
01: 10-bit
10: 8-bit
11: 6-bit
1. The watchdog comparison is performed on the raw converted data before any alignment calculation and
before applying any offsets (the data which is compared is not signed).
Description of analog watchdog 2 and 3
The second and third analog watchdogs are more flexible and can guard several selected
channels by programming the corresponding bits in AWDxCH[18:1] (x=2,3).
The corresponding watchdog is enabled when any bit of AWDxCH[18:0] (x=2,3) is set.
They are limited to a resolution of 8 bits and only the 8 MSBs of the thresholds can be
programmed into HTx[7:0] and LTx[7:0].
performed for all the possible resolutions.
Resolution
(bits
RES[1:0])
00: 12-bit
01: 10-bit
10: 8-bit
11: 6-bit
describes how the comparison is performed for all the possible resolutions for

Table 92. Analog watchdog 1 comparison

Analog watchdog comparison
between:
Raw converted
(1)
data, left aligned
DATA[11:0]
DATA[11:2],00
DATA[11:4],0000
DATA[11:6],000000

Table 93. Analog watchdog 2 and 3 comparison

Analog watchdog comparison between:
Raw converted data,
(1)
left aligned
DATA[11:4]
DATA[11:4]
DATA[11:4]
DATA[11:6],00
DocID025202 Rev 7
Analog-to-digital converters (ADC)
Thresholds
LT1[11:0] and
HT1[11:0]
LT1[11:0] and User must configure LT1[1:0] and HT1[1:0] to
HT1[11:0] 00
LT1[11:0] and User must configure LT1[3:0] and HT1[3:0] to
HT1[11:0] 0000
LT1[11:0] and User must configure LT1[5:0] and HT1[5:0] to
HT1[11:0] 000000
Table 93 describes how the comparison is
Thresholds
LTx[7:0] and DATA[3:0] are not relevant for the
HTx[7:0] comparison
LTx[7:0] and DATA[3:2] are not relevant for the
HTx[7:0] comparison
LTx[7:0] and
HTx[7:0]
LTx[7:0] and User must configure LTx[1:0] and
HTx[7:0] HTx[1:0] to 00
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