Analog Integrated Circuit Device Data

28

Freescale Semiconductor

34921

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

NORMAL MODE:

Normal mode is the normal operating mode of the IC (as opposed to the Configuration mode or Information Request mode).

Table 10. NORMAL Mode Input Frame Programming Model

Table 11. NORMAL Input Frame Bit Allocation (29)

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OUT2

OUT1

B

B

A

/Cdcb A/Cdca

Adcb

Adca

Bdcb

Bdca

GATE

OUT

A/Da2

A/Da1

A/Da0

start

config

Bit

Bit Name

Bit Description

15– 14

OUT2, OUT1

High-side or low-side output control. Bit 4 of the configuration mode input frame determines which output is

controlled. Output turns on when corresponding bit is asserted. Refer to Table 20 and Table 21 Truth Tables,

page 31 and page 32, respectively, for operation.

13– 10

B

,B, A,A

(31)

Step motor outputs, inverting. Corresponding output on when bit asserted. Refer to Table 22 Truth Table,

page 32, for operation.

11– 10

A

/Cdca, A/Cdcb

(30)

Motor driver C direction bits. Outputs follow these bits, regardless of PWM value, when they are equal; i.e., 00

or 11. Refer to Table 19 Truth Table, page 31, for operation.

9– 8

Adcb, Adca

Motor driver A direction bits. Outputs follow these bits, regardless of PWM value, when the are equal; i.e., 00

or 11. Refer to Table 19 Truth Table, page 31, for operation.

7– 6

Bdcb, Bdca

Motor driver B direction bits. Outputs follow these bits, regardless of PWM value, when the are equal; i.e., 00

or 11. Refer to Table 19 Truth Table, page 31, for operation.

5

GATEOUT

4–2

A/Da[2:0]

A/D conversion target channel. These bits determine which input(s) to the ADC are to be converted.

1

start

A/D conversion start bit. This bit causes the ADC to sample the input(s) specified by bits A/Da[2:0] (bits [4:2])

and begin an analog-to-digital conversion. This bit is ignored if a conversion is already in progress.

0

config

The input frame can be either a configuration frame or a normal frame. Bit 0 determines the type of frame being

received. Bit 0 = 0 is a normal mode input frame.

Notes

29.

All defaults = 0 at power up.

30.

When in DC motor mode.

31.

When in step motor mode, outputs are A, A, B, and B; when in DC motor mode, outputs B and B have no function.