ADIS16IMU2SLASHPCBZ datasheet(16/23 Pages) AD

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ADIS16446

Data Sheet

Rev. 0 | Page 16 of 23

INPUT AND OUTPUT CONFIGURATION

DATA READY INDICATOR

The data ready indicator provides a signal that indicates

when the registers are updating so that system processors can

avoid data collision, which is a condition when the internal

processor requests it. The data ready signal has valid and

invalid states. Using the transition from invalid to valid to

trigger an interrupt service routine provides the most time for

data acquisition (before the next register update). See Figure 4

and Table 2 for specific timing information. MSC_CTRL,

Bits[2:0] (see Table 24) provide control bits for enabling this

function, selecting the polarity of the valid state and I/O line

assignment (DIO1 and DIO2). The factory default setting of

MSC_CTRL, Bits[2:0] = 110 (DIN = 0xB406) establishes DIO1

as a data ready output line and assigns the valid state with a

logic high (1). Set MSC_CTRL, Bits[2:0] = 100 (DIN = 0xB404) to

change the polarity of the data ready signal on DIO1 for

interrupt inputs that require negative logic inputs for

activation.

GENERAL-PURPOSE INPUT AND OUTPUT

DIO1, DIO2, DIO3, and DIO4 are configurable, general-purpose

input and output lines that serve multiple purposes. The data

ready controls in MSC_CTRL, Bits[2:0] have the highest

priority for configuring DIO1 and DIO2. The alarm indicator

controls in ALM_CTRL, Bits[2:0] have the second highest priority

for configuring DIO1 and DIO2. The external clock control

associated with SMPL_PRD, Bit 0 has the highest priority for

DIO4 configuration (see Table 28). GPIO_CTRL in Table 27 has

the lowest priority for configuring DIO1, DIO2, and DIO4, and

has absolute control over DIO3.

Table 27. GPIO_CTRL (Base Address = 0x32), Read/Write

Bits

Description (Default = 0x0000)

[15:12]

Not used

General-Purpose I/O Line 4 (DIO4) data level

General-Purpose I/O Line 3 (DIO3) data level

General-Purpose I/O Line 2 (DIO2) data level

General-Purpose I/O Line 1 (DIO1) data level

[7:4]

Not used

General-Purpose I/O Line 4 (DIO4) direction control

1 = output, 0 = input

General-Purpose I/O Line 3 (DIO3) direction control

1 = output, 0 = input

General-Purpose I/O Line 2 (DIO2) direction control

1 = output, 0 = input

General-Purpose I/O Line 1 (DIO1) direction control

1 = output, 0 = input

Example Input and Output Configuration

For example, set GPIO_CTRL, Bits[3:0] = 0100 (DIN = 0xB204)

to set DIO3 as an output signal pin and DIO1, DIO2, and

DIO4 as input signal pins. Set the output on DIO3 to 1 by

setting GPIO_CTRL, Bit 10 = 1 (DIN = 0xB304). Then, read

GPIO_CTRL, Bits[7:0] (DIN = 0x3200) and mask off

GPIO_CTRL, Bits[9:8] and GPIO_CTRL, Bit 11 to monitor

the digital signal levels on DIO4, DIO2, and DIO1.

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