ADIS16240ABCZ datasheet(11/16 Pages) AD

11 / 16 page

ADIS16240

Rev. 0 | Page 11 of 1

OUTPUT DATA REGISTERS

Each output data register uses the bit assignments shown in

Figure 19. The ND flag indicates that unread data resides in the

It returns to 1 after the next internal sample updates the register

with new data. When the data-ready function (the DIO1 and

DIO2 pins and the MSC_CTRL register; see Table 25) drives

data collection, the ND bit is always high and does not require

validation. The EA flag indicates that one of the error flags in the

DIAG_STAT register (see Table 28) is active (true).

MSB FOR 10-BIT OUTPUT

D9D8D7D6D5D4

D3D2D1

Figure 19. Output Register Bit Assignments

Table 8. Output Data Register Formats

Bits

Format

Scale

SUPPLY_OUT

Binary, 0 V = 0x0000

4.88 mV

XACCL_OUT

Twos complement

51.4 mg

YACCL_OUT

Twos complement

51.4 mg

ZACCL_OUT

Twos complement

51.4 mg

AUX_ADC

Binary, 0 V = 0x0000

VDD/1024

TEMP_OUT

Binary, 25°C = 0x0133

0.244°C

XPEAK_OUT1

Twos complement

51.4 mg

YPEAK_OUT1

Twos complement

51.4 mg

ZPEAK_OUT1

Twos complement

51.4 mg

XYZPEAK_OUT2

Binary, 0 g2 = 0x0000

0.676 g2

1 Function requires MSC_CTRL[14] = 1.

2 Function requires MSC_CTRL[15] = 1.

Processing Sensor Data

Processing sensor data starts with reading the appropriate output

data register using the SPI. For example, use DIN = 0x0E00

to read the XPEAK_OUT register. Use the ND and EA bits to

validate new data and normal operating status, if necessary. Then

mask off all of the nondata bits and calculate the data, using the

format and scale information shown in Table 8. For example,

XACCL_OUT[9:0] and XYZPEAK_OUT[11:0] contain all

relevant data for their function. Table 9, Table 10, and Table 11

provide output code examples for each output register.

Table 9. Accelerometer Data Output Format1

Binary

Hex

Codes

Acceleration

01 0011 0111

0x137

+311

+16 g

…

00 0000 0010

0x002

+102.8 mg

00 0000 0001

0x001

+51.4 mg

00 0000 0000

0x000

11 1111 1111

0x3FF

−1

−51.4 mg

11 1111 1110

0x3FE

−2

−102.8 mg

…

10 1100 1001

0x2C9

−311

−16 g

1 The XACCL_OUT register is located at Address 0x05[15:8] and Address 0x04[7:0].

The YACCL_OUT register is located at Address 0x07[15:8] and Address 0x06[7:0].

The ZACCL_OUT register is located at Address 0x09[15:8] and Address 0x08[7:0].

The XPEAK_OUT register is located at Address 0x0F[15:8] and Address 0x0E[7:0].

The YPEAK_OUT register is located at Address 0x11[15:8] and Address 0x10[7:0].

The ZPEAK_OUT register is located at Address 0x13[15:8] and Address 0x12[7:0].

When MSC_CTRL[14] = 1, the XPEAK_OUT, YPEAK_OUT,

and ZPEAK_OUT registers track the peak acceleration in each

acceleration output register. When MSC_CTRL[15] = 1, use the

following equation to calculate the root mean square (rms) of all

three peak registers, where 1 LSB = 0.822 g:

OUT

XYZPEAK

XYZ

rms

Set GLOB_CMD[5] = 1 to reset these registers to 0x0000.

Table 10. Power Supply Data Output Format1

Binary

Hex

Codes

Power Supply (V)

10 1110 0010

0x2E2

738

3.6

…

10 1010 0101

0x2A5

677

3.30488

10 1010 0100

0x2A4

676

3.3

10 1010 0011

0x2A3

675

3.29502

…

01 1110 1100

0x1EC

492

2.4

1 The SUPPLY_OUT register is located at Address 0x03[15:8] and Address 0x02[7:0].

Table 11. Temperature Data Output Format1

Binary

Hex

Codes

Temperature (°C)

10 0010 1001

0x229

553

+85°C

…

01 0011 0100

0x134

308

+25.244°C

01 0011 0011

0x133

307

+25°C

01 0011 0010

0x132

306

+24.756°C

…

00 0010 1001

0x029

−40°C

1 The TEMP_OUT register is located at Address 0x0D[15:8] and Address 0x0C[7:0].

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