ADS9128RHAR datasheet(21/67 Pages) TI2

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Table 6-2. Sequence to Read Temperature Sensor Output

VALUE

COMMENT

0x90

0x4000

Write register to load temperature

sensor output in address 0x91

0x91

10-bit temperature sensor data

Read register for temperature

sensor output

0x90

0x0000

Write register

6.3.6 Data Averaging

The ADS912x features a built-in decimation filter that averages the conversion results from the ADC. The

output data rate is reduced with higher data averaging. Table 6-3 shows the register settings corresponding to

oversampling ratios.

As shown in Figure 6-4, a pulse on the SMPL_SYNC pin resets the decimation filter. A pulse on SMPL_SYNC

synchronizes multiple ADS912x devices when using the decimation filter.

Table 6-3. Register Map Settings for OSR

DECIMATION

VALUE

OSR initialization

CLK3 (0xC5[9])

OSR_INIT1 (0xC0[11:10])

OSR_INIT2 (0xC4[5:4])

OSR_INIT3 (0xC4[1])

OSR_EN (0x0D[6])

OSR (0x0D[5:2])

OSR_CLK (0xC0[9:7])

OSR (0x0D[5:2])

OSR_CLK (0xC0[9:7])

OSR (0x0D[5:2])

OSR_CLK (0xC0[9:7])

OSR (0x0D[5:2])

OSR_CLK (0xC0[9:7])

SMPL_SYNC

SMPL_CLK

ADC Data for

Decimation by 2

invalid data

(S1 + S2) / 2

(S3 + S4) / 2

(S5 + S6) / 2

ADC Data for

Decimation by 4

invalid data

(S1 + S2 + S3 + S4) / 2

S10

S11

S12

S13

S14

S15

S16

S17

(S7 + S8) / 2

(S9 + S10) / 2 (S11 + S12) / 2 (S13 + S14) / 2 (S15 + S16) / 2

(S5 + S6 + S7 + S8) / 4

(S9 + S10 + S11 + S12) / 4

(S13 + S14 + S7 + S8) / 4

ADC Data for

Decimation by 8

invalid data

(S1 + S2 + . . . + S8) / 8

(S9 + S10 + . . . + S16) / 8

ADC Data for

Decimation by 16

invalid data

(S1 + S2 + . . . + S16) / 16

(S17 + S18) / 2

S18

S19

S20

S21

Figure 6-4. Data Output With Decimation

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SBASB82 – MAY 2025

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