33784 Datasheet, PDF (22/30 Pages) Freescale Semiconductor, Inc – DSI 2.02 Sensor Interface

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Data
Address
Command
– L2 L1 L0 – DR2 DR1 DR0 A3 A2 A1 A0 0
0
1
1
Not Valid
Not Valid
Word Type
LW & ELW
SW & ESW (8-bit)
ESW (10-bit)
Response
Word Type
A3 A2 A1 A0 0 0 0 0 0 L2 L1 L0 0 DR2 DR1 DR0
LW & ELW
No Response
SW & ESW (8-bit)
No Response
ESW (10-bit)
Legend
A [3:0] = Address bits.
DR [2:0] = I / O direction bits. 1 = Output. All bits are set to 0
by reset / clear.
“–” = Don’t care bit. Can be 0 or 1.
L[2:0] = Level to output on I/O if configured as outputs.
Figure 14. I/O Control Command and Response Format
REQUEST ID COMMAND AND RESPONSE
This command will cause the device ID information to be
read from internal storage and returned to the master. The
command format is found in Figure 15.
The response is sent during the next message following a
valid Request ID command to the addressed device.
Because this is a long-word only command, there is no short
word response.
The 33784 will only act on this command if the address bits
in the command match with the address that the device was
initialized. If the addresses do not match, the device will do
nothing and no response will be generated.
Data
Address
Command
– – – – – – – – A3 A2 A1 A0 0 1 0 0
Not Valid
Not Valid
Word Type
LW & ELW
SW & ESW (8-bit)
ESW (10-bit)
Response
Word Type
A3 A2 A1 A0 0 0 0 0 V3 V2 V1 V0 0 0 0 FPA
R
LW & ELW
No Response
SW & ESW (8-bit)
No Response
ESW (10-bit)
Legend
A [3:0] = Address bits. The address of the selected device.
An address value of 0000 is ignored by all devices.
“–” = Don’t care bit. Can be 0 or 1.
V [3:0] = Device version number. The silicon version
number of the device. V0 always = 0, indicating MC33784
FPAR = Some parameters in the device are trimmed by
fuses. Since these parameters can be impacted by the
state of the fuses a fuse parity is calculated and stored
during device manufacturing. When the device is powered
up the current fuse parity is checked against the stored
parity. If they do not match this bit is set.
Figure 15. Request ID Command and Response Format
33784
22
Analog Integrated Circuit Device Data
Freescale Semiconductor