FDC2114 datasheet(15/61 Pages) TI1

15 / 61 page

SENSO

FDC2212, FDC2214, FDC2112, FDC2114

www.ti.com

SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015

Table 3. Single- and Multi-Channel Configuration Registers

MODE

FIELD [ BIT(S) ]

VALUE

00 = chan 0

01 = chan 1

CONFIG, addr 0x1A

ACTIVE_CHAN [15:14]

10 = chan 2

Single channel

11 = chan 3

0 = continuous conversion on a

MUX_CONFIG addr 0x1B

AUTOSCAN_EN [15]

single channel (default)

1 = continuous conversion on

MUX_CONFIG addr 0x1B

AUTOSCAN_EN [15]

multiple channels

00 = Ch0, Ch 1

Multi-channel

MUX_CONFIG addr 0x1B

RR_SEQUENCE [14:13]

01 = Ch0, Ch 1, Ch 2

10 = Ch0, CH1, Ch2, Ch3

The digitized sensor measurement for each channel (DATAx) represents the ratio of the sensor frequency to the

reference frequency.

The data output (DATAx) of the FDC2112 and FDC2114 is expressed as the 12 MSBs of a 16-bit result:

(1)

The data output (DATAx) of the FDC2212 and FDC2214 is expressed as:

(2)

Table 4 illustrates the registers that contain the fixed point sample values for each channel.

Table 4. Sample Data Registers

CHANNEL(1)

FIELD NAME [ BITS(S) ] AND

FIELD NAME [ BITS(S) ] AND VALUE

VALUE (FDC2112, FDC2114)

(FDC2212, FDC2214) (3)(4)

DATA_CH0, addr 0x00

DATA0 [11:0]:

DATA0 [27:16]:

12 bits of the 16 bit result.

12 MSBs of the 28 bit result

0x000 = under range

0xfff = over range

DATA_LSB_CH0, addr 0x01

Not applicable

DATA0 [15:0]:

16 LSBs of the 28 bit conversion result

DATA_CH1, addr 0x02

DATA1 [11:0]:

DATA1 [27:16]:

12 bits of the 16 bit result.

12 MSBs of the 28 bit result

0x000 = under range

0xfff = over range

DATA_LSB_CH1, addr 0x03

Not applicable

DATA1 [15:0]:

16 LSBs of the 28 bit conversion result

DATA_CH2, addr 0x04

DATA2 [11:0]:

DATA2 [27:16]:

12 bits of the 16 bit result.

12 MSBs of the 28 bit result

0x000 = under range

0xfff = over range

DATA_LSB_CH2, addr 0x05

Not applicable

DATA2 [15:0]:

16 LSBs of the 28 bit conversion result

(1)

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

(2)

The DATA_CHx.DATAx register must always be read first, followed by the DATA_LSB_ CHx.DATAx register of the same channel to

ensure data coherency.

(3)

A DATA value of 0x0000000 = under range for FDC2212/FDC2214.

(4)

A DATA value of 0xFFFFFFF = over range for FDC2212/FDC2214.

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