FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Table 15. CCD1 Constant Current Controller Commands
Command
Control Address
Command Bits
15
1
14
13
12
11
0
10
9
8
0
7
0
6
5
4
3
2
0
1
0
0
0
CCD1 Command Address
Diag DTHR
Pull Up DIS
9 BIT DAC Command Data
CCD1 Control
0 = Pull Down
Current Source
1 = Pull Up Current
Source
0
1
1
0
0
0
0
0
0
CCD1 Command Address
CCD1 ON/ CCD1 TLim
Dither Amplitude
Dither Frequency
Retry OFF
DIS
EN
CCD1 Frequency
& Amplitude
1
0
1
1
1
1
0
0
1
0
1
1
0
1
0
0
NextSOResponse
(Message 2)
0 = No Fault, 1 =
Fault
OvrVlt Reset Trim VCAL Open Short Open Short Fault Fault Fault Fault Fault Fault Fault Fault
TLimor
CAL Flt
Set(19) Status Fault Fault Fault Fault Status Status Status Status Status Status Status Status
int=0 CCD2 CCD2 CCD1 CCD1 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1
ext=1
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
Table 17. CCD1 Dither Amplitude Select
Bits 3210
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Dither Frequency
Dither Off
50Hz
Bits 654
000
Dither Amplitude
Dither Off
50.4mA
001
100Hz
010
100.8mA
150Hz
011
151.2mA
200Hz
100
201.6mA
250Hz
101
252.0mA
300Hz
110
302.4mA
350Hz
111
352.8mA
400Hz
CCD2 CONSTANT CURRENT CONTROLLER
450Hz
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.
500 Hz
133Hz
166Hz
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
233Hz
266Hz
No change
Notes: Frequencies above 250Hz are +- 20%
33800
Analog Integrated Circuit Device Data
Freescale Semiconductor
28
FREESCALE [ Freescale ]
