ADIS16501SLASHPCBZ datasheet(38/45 Pages) AD

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Data Sheet

ADIS16501

USER REGISTER DEFINITIONS

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Rev. B | 38 of 45

Table 107. MSC_CTRL Bit Definitions (Continued)

Bits

Description

0 = burst data has gyroscope and accelerometer data.

Reserved

Point of percussion alignment. When set, this bit allows for relocation

of the acceleration sensors to a common point of percussion on the

package corner by considering angular rotations.

1 = enabled (default).

0 = disabled.

Reserved

SENS_BW. Internal sensor bandwidth.

0 = wide bandwidth (default), see Table 1.

1 = 370 Hz. The gyroscope group delay increases by 0.17 ms and

the accelerometer group delay increases by 0.63 ms in this mode.

[3:2]

SYNC mode select (see the Clock Control section for more informa-

tion).

00 = internal SYNC (default). Internal 2 kHz clock used.

01 = direct input sync mode. The user provides an external input

clock between 1900 Hz and 2100 Hz.

10 = scaled sync mode. The user provides an external input clock

between 1 Hz and 128 Hz, which upscales to 1900 Hz to 2100 Hz

inside the ADIS16501.

11 = output sync mode. Identical to internal sync mode, except the

SYNC pin functions as an output signal, indicating when the internal

clock samples sensors.

SYNC polarity (input or output).

1 = rising edge triggers sampling.

0 = falling edge triggers sampling (default).

DR polarity. This bit controls the polarity of the DR pin.

1 = active high when data is valid.

0 = active low when data is valid (default).

Point of Percussion

The MSC_CTRL register, Bit 6 (see Table 107) offers an on/off

control for the point of percussion alignment function, which maps

the accelerometer sensors to the corner of the package that is

closest to Pin A1 (see Figure 59). The factory default setting in

the MSC_CTRL register activates this function. To turn this function

off while retaining the rest of the factory default settings in the

MSC_CTRL register, set Register MSC_CTRL, Bit 6 = 0 using

the following command sequence on the DIN pin: 0xE081, then

0xE100.

Figure 59. Point of Percussion Reference Point

Sync Mode Select

Refer to the Clock Control section for the functions of the sync

mode select bits.

Sync Input Frequency Multiplier (UP_SCALE)

Table 108. UP_SCALE Register Definition

Addresses

Default

Access

Flash Backup

0x62, 0x63

0x07D0

R/W

Yes

Table 109. UP_SCALE Bit Definitions

Bits

Description

[15:0]

KECSF, binary format

Refer to the Clock Control section for the function and programming

of the UP_SCALE register.

Decimation Filter (DEC_RATE)

Table 110. DEC_RATE Register Definition

Addresses

Default

Access

Flash Backup

0x64, 0x65

0x0000

R/W

Yes

Table 111. DEC_RATE Bit Definitions

Bits

Description

[15:11]

Don’t care

[10:0]

Decimation rate, binary format, maximum = 1999

The DEC_RATE register (see Table 110 and Table 111) provides

user control for the averaging decimating filter, which averages and

decimates the gyroscope and accelerometer data. The DEC_RATE

velocity track between each update. When the ADIS16501 operates

in internal clock mode (see Register MSC_CTRL, Bits[3:2], in Table

107), the nominal output data rate is equal to 2000/(DEC_RATE

+ 1). For example, set DEC_RATE = 0x0013 to reduce the output

sample rate to 100 SPS (2000 ÷ 20) using the following DIN pin

sequence: 0xE413, then 0xE500.

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