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33800 Datasheet(PDF) 25 Page - Freescale Semiconductor, Inc

Part # 33800
Description  Engine Control Integrated Circuit
PDF  39 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33800 Datasheet(HTML) 25 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
25
33800
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
ON/OFF CONTROL COMMAND
To program the 8 outputs of the 33800 ON or OFF, a 16-
bit serial stream of data is entered into the SI pin. The first 8-
bits of the control word are used to identify the on/off
command and the remaining 8-bits are used to turn ON or
OFF the specific output driver. When commanding an output
ON or OFF, the Most Significant Bit (MSB) is sent and
received first. Bit 7 corresponds to output 8 down to bit 0
which corresponds to output 1.
OPEN LOAD CURRENT ENABLE COMMAND
The Open Load Enable Command is provided to enable or
disable the open load detect pull-down current. This feature
allows the device to be used in LED applications. On power
up reset (POR) or the RESET command the pull-down
current sources are disabled. To enable the open load
current source, the user must program the Open Load
Current Disable Control register with logic[1]. Open load
faults may not be reported with the pull-down current source
disabled.
OVER-VOLTAGE SHUTDOWN/RETRY COMMAND
The Over Voltage Shutdown/Retry Command allows the
user to select the fault strategy for the outputs. The over-
voltage control bit sets the operation of the outputs when
returning from over-voltage. Setting the over-voltage bit to
logic[0] will force all outputs to remain OFF when VPWR
returns to normal level. Setting the over-voltage bit to logic[1]
will command outputs to resume their previous state when
VPWR returns to normal level.
TLIM COMMAND, TIMER COMMAND
The TLim and Timer commands are used to enhance the
short circuit protection strategy of the Octal Serial Switch
output drivers.
The Timer protection scheme uses a low duty cycle in the
event of a short circuit. The TLim protection circuit uses the
Table 12. OSS SPI Control Commands and Response
Command
Control Address
Command Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OSS ON/OFF Command
0 = off, 1 = on
0
0
0
0
1
X
X
X
0
0
0
0
0
0
0
0
Open Load Current Enable
0 = disable, 1 = enable
0
0
0
1
0
X
X
X
0
0
0
0
0
0
0
0
Shutdown/Retry from VPWR Over
Voltage
0 = shutdown, 1 = retry
0
0
0
1
1
X
X
X
1
1
1
1
1
1
1
1
Shutdown/Retry from Short
Circuit
0 = shutdown, 1 = retry
0
0
1
0
0
X
X
X
1
1
1
1
1
1
1
1
TLim Command
0 = disable, 1 = enable
0
0
1
0
1
X
X
X
1
1
1
1
1
1
1
1
Fault Timer Command
0 = Fault Timer Disabled
1 = Fault Timer Enabled
0
0
1
1
0
X
X
X
1
1
1
1
1
1
1
1
Parallel
Outputs(7&8,5&6,3&4,1&2)
Parallel Input Pin Enable
0 = Individual Control, PX enabled
1 = Parallel Control, PX disabled
0
0
1
1
1
X
X
X
0
Output
7&8
0
Output
5&6
0
Output
3&4
0
Output
1&2
0
P7 en
0
P5 en
0
P3 en
0
P1 en
AND/OR Control
0 = PX Pin OR with SPI
1 = PX Pin AND with SPI
0
1
0
0
0
X
X
X
0
0
0
0
0
0
0
0
Next SO Response (Message 1)
0 = No Fault, 1 = Fault
OvrVlt
,TLim
or
CAL
Flt
Reset Fault
Statu
sPW
M6
Fault
Statu
sPW
M5
Fault
Statu
sPW
M4
Fault
Statu
sPW
M3
Fault
Statu
sPW
M2
Fault
Statu
sPW
M1
Fault
Statu
sOUT
8
Fault
Statu
sOUT
7
Fault
Statu
sOUT
6
Fault
Statu
sOUT
5
Fault
Statu
sOUT
4
Fault
Statu
sOUT
3
Fault
Statu
sOUT
2
Fault
Statu
sOUT
1



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