Analog Integrated Circuit Device Data

28

Freescale Semiconductor

33800

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

CCD2 CONSTANT CURRENT CONTROLLER

The CCD2 constant current controller is a switching

hysteretic current controller with a superimposed dither. The

controller is designed to provide a programmable constant

current through a solenoid valve. By controlling current

through the solenoid valve, fluid flow control is achieved.

The master SPI device sends 16-bit command words to

the 33800 device (see Table 18). The master device sets up

the output current based on the CCD2 Control command.

The IC is capable of sinking an average output current from

0.0mA to 232mA (without dither). If operating the device with

dither, the DAC + Dither value must be less than 232mA or

Table 15. CCD1 Constant Current Controller Commands

Command

Control Address

Command Bits

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

CCD1 Command Address

Diag

Pull Up

DTHR

DIS

9 BIT DAC Command Data

CCD1 Control

0 = Pull Down

Current Source

1 = Pull Up Current

Source

1

0

1

1

0

0

0

0

0

0

0

0

0

0

0

0

CCD1 Command Address

CCD1

Retry

ON/

OFF

CCD1

DIS

TLim

EN

Dither Amplitude

Dither Frequency

CCD1 Frequency

& Amplitude

1

0

1

1

1

1

0

0

1

0

1

1

0

1

0

0

Next SO Response

(Message 2)

0 = No Fault, 1 =

Fault

OvrVlt

TLim or

CAL Flt

Reset

Trim

Set(19)

VCAL

Status

int=0

ext=1

Open

Fault

CCD2

Short

Fault

CCD2

Open

Fault

CCD1

Short

Fault

CCD1

Fault

Status

OUT8

Fault

Status

OUT7

Fault

Status

OUT6

Fault

Status

OUT5

Fault

Status

OUT4

Fault

Status

OUT3

Fault

Status

OUT2

Fault

Status

OUT1

Notes

19.

Trim Set bit indicates (0=untrimmed, 1= trimmed)

20.

VCAL Status bit indicates when internal or external supply is used. VCAL Bit = 0 indicates external, VCAL Bit = 1indicates internal.

21.

Reset Bit indicates the device has performed a POR.

22.

CCD1 DISable bit allows the CCD1 driver to operate as a standard 1.0A low side driver. With CCD1_DIS bit = 1 the CCD1 function is

disabled.

Table 16. CCD1 Dither Frequency Select

Bits 3210

Dither Frequency

0000

Dither Off

0001

50Hz

0010

100Hz

0011

150Hz

0100

200Hz

0101

250Hz

0110

300Hz

0111

350Hz

1000

400Hz

1001

450Hz

1010

500 Hz

1011

133Hz

1100

166Hz

1101

233Hz

1110

266Hz

1111

No change

Notes: Frequencies above 250Hz are +- 20%

Table 17. CCD1 Dither Amplitude Select

Bits 654

Dither Amplitude

000

Dither Off

001

50.4mA

010

100.8mA

011

151.2mA

100

201.6mA

101

252.0mA

110

302.4mA

111

352.8mA