FDC2114RGHT datasheet(19/60 Pages) TI1

19 / 60 page

REFx

SENSORx

CHx_FIN_S

'$7$

OFFSET

(12 OUTP

SENSORx

REF

UT_GAIN

)

CHx

DATAx

CHx_FIN_SEL

SENSO

SOR

L (2

FDC2212, FDC2214, FDC2112, FDC2114

www.ti.com

SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015

Table 8. Frequency Offset Registers

CHANNEL(

FIELD [ BIT(S) ]

VALUE

OFFSET_CH0, addr 0x0C

CH0_OFFSET [ 15:0 ]

fOFFSET0 = CH0_OFFSET * (fREF0/2

16)

OFFSET_CH1, addr 0x0D

CH1_OFFSET [ 15:0 ]

fOFFSET1 = CH1_OFFSET * (fREF1/2

16)

OFFSET_CH2, addr 0x0E

CH2_OFFSET [ 15:0 ]

fOFFSET2 = CH2_OFFSET * (fREF2/2

16)

OFFSET_CH3, addr 0x0F

CH3_OFFSET [ 15:0 ]

fOFFSET3 = CH3_OFFSET * (fREF3/2

16)

(1)

Channels 2 and 3 are only available for FDC2114 and FDC2214.

The sensor capacitance CSENSE of a differential sensor configuration can be determined by:

where

•

C = parallel sensor capacitance (see Figure 55)

(7)

The FDC2112 and FDC2114 sensor frequency fSENSORx can be determined by:

where

•

DATAx = Conversion result from the DATA_CHx register

•

CHx_OFFSET = Offset value set in the OFFSET_CHx register

•

OUTPUT_GAIN = output multiplication factor set in the RESET_DEVICE.OUTPUT_GAIN register

(8)

The FDC2212 and FDC2214 sensor frequency fSENSORx can be determined by:

(FDC2212, FDC2214)

where

•

DATAx = Conversion result from the DATA_CHx register

(9)

9.3.3 Current Drive Control Registers

The registers listed in Table 9 are used to control the sensor drive current. The recommendations listed in the

last column of the table should be followed.

Table 9. Current Drive Control Registers

CHANNEL(1)

FIELD [ BIT(S) ]

VALUE

CONFIG, addr 0x1A

SENSOR_ACTIVATE_SEL [11]

Sets current drive for sensor activation.

All

Recommended value is b0 (Full Current

mode).

CONFIG, addr 0x1A

HIGH_CURRENT_DRV [6]

b0 = normal current drive (1.5 mA)

b1 = Increased current drive (> 1.5 mA)

for Ch 0 in single channel mode only.

Cannot be used in multi-channel mode.

DRIVE_CURRENT_CH0, addr 0x1E CH0_IDRIVE [15:11]

Drive current used during the settling and

conversion time for Ch. 0. Set such that

1.2V

≤ sensor oscillation amplitude (pk) ≤

1.8V

DRIVE_CURRENT_CH1, addr 0x1F CH1_IDRIVE [15:11]

Drive current used during the settling and

conversion time for Ch. 1. Set such that

1.2V

≤ sensor oscillation amplitude (pk) ≤

1.8V

(1)

Channels 2 and 3 are available for FDC2114 and FDC2214 only.

Submit Documentation Feedback

Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114

FDC2114RGHT Datasheet(PDF) 19 Page - Texas Instruments

FDC2114RGHT Datasheet(HTML) 19 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

Datasheet Download

Link URL