LMP90100MHESLASHNOPB datasheet(29/69 Pages) TI1

29 / 69 page

Yes

Set

BGCALCN = 10b to

operate the device in

BgcalMode2

Is the channel

JDLQ • 16x?

Set CH_SCAN_SEL = 10b to

operate the device in

ScanMode2. Set FIRST_CH &

LAST_CH accordingly.

Set FGA_BGCAL = 0 (default)

Correct FGA

error?

Yes

Set

FGA_BGCAL = 1 to

correct for FGA error

using the last known

coefficients.

LMP90100

www.ti.com

SNAS510P – JANUARY 2011 – REVISED MARCH 2013

The benefits of using type 2 calibration is a higher throughput, lower power consumption, and slightly better

noise. The exact savings would depend on the number of channels being scanned, and the ODR and gain of

each channel.

Using Background Calibration:

There are four modes of background calibration, which can be programmed using the BGCALCN bits. They are

as follows:

1. BgcalMode0: Background Calibration OFF

2. BgcalMode1: Offset Correction / Gain Estimation

3. BgcalMode2: Offset Correction / Gain Correction

–

Follow Figure 45 to set other appropriate registers when using this mode.

4. BgcalMode3: Offset Estimation / Gain Estimation

Figure 45. BgcalMode2 Register Settings

If operating in BgcalMode2, four channels (with the same ODR) are being converted, and FGA_BGCAL = 0

(default), then the ODR is reduced by:

1. 0.19% of 1.6775 SPS

2. 0.39% of 3.355 SPS

3. 0.78% of 6.71 SPS

4. 1.54% of 13.42 SPS

5. 3.03% of 26.83125 SPS

6. 5.88% of 53.6625 SPS

7. 11.11% of 107.325 SPS

8. 20% of 214.65 SPS

System Calibration

The LMP90xxx provides some unique features to support easy system offset and system gain calibrations.

The System Calibration Offset Registers (CHx_SCAL_OFFSET) hold the System Calibration Offset Coefficients

in 24-bit, two's complement binary format. The System Calibration Gain Registers (CHx_SCAL_GAIN) hold the

System Calibration Gain Coefficient in 24-bit, 1.23, unsigned, fixed-point binary format. For each channel, the

System Calibration Offset coefficient is subtracted from the conversion result prior to the division by the System

Calibration Gain Coefficient.

Submit Documentation Feedback

Product Folder Links: LMP90100

LMP90100MHE/NOPB Datasheet(PDF) 29 Page - Texas Instruments

LMP90100MHE/NOPB Datasheet(HTML) 29 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69

Datasheet Download

Link URL