ata5279n ATMEL Corporation, ata5279n Datasheet - Page 21

• Manufacturer Part Number: ata5279n
• Description: Antenna Driver For Multiple Antennas
• Manufacturer: ATMEL Corporation

3.9.3
9125C–RKE–01/09
Driver-related Command Description
Following commands are processed via the LF data buffer:
Table 3-5.
Command
Select driver
Select coil current
Send LF data
Send LF carrier
• Reset Fault Status:
• Set SPI Config:
• Halt Operation:
• Select Driver:
This command clears the content of the driver stage fault register and sets the operability bit
in the general state register if all supply voltages are present and valid. This command is
necessary to resume normal operation following the occurrence and subsequent removal of
a fault. Please note that prior to this command, the active channel should be switched to a
line that is not faulty. Otherwise, the internal logic might get corrupted and must then be reset
with a negative pulse on the NRES line.
Note that this command is also required to bring ATA5279N back into operation mode once
the diagnosis mode was active and was then cleared by a Select Driver command.
This command changes the two configuration bits PO(L) and PH(A). These bits are
responsible for the serial data processing of the SPI.
Default: PO = 1, PH = 1
As this command is processed immediately, it is not written to the FIFO buffer even if it is a
driver-related command. The effect of this command is that the content of the FIFO buffer is
cleared, hence no new LF data is available, and if any driver is active it will be stopped. Note
that such stops are only carried out at the end of an LF period (i.e., when the sinusoidal
output signal reaches half of the supply voltage).
This command selects the coil that is to be driven or tested next. The BR-bit indicates the
modulation speed (0 for 4 kbit/s, i.e., 32 LF periods and 1 for 5.7 kbit/s, i.e., 22 LF periods).
The D
high-current driver 1..3, 1 for low-current driver 4..6) and D
(01 for driver 1 / 4, 11 for driver 3 / 6).
For connection line diagnosis, the diagnosis mode can be enabled by setting the DM-bit to 1.
Note that if set, all coil connections are switched into this mode and no normal operation (i.e.,
no LF transmission) is possible. The same is true for the opposite way: once a Select Driver
command is received with the DM-bit at 0, all connection lines are switched back to normal
operation mode. Note that for a proper operation after a diagnosis run, a Reset Fault Status
command also needs to be sent.
G,1..0
bits indicate the channel number to be activated. D
Bit Definitions of the Driver-Related SPI Commands
L
0
1
0
..
1
7
L
0
6
0
0
..
0
6
L
5
1
1
0
..
0
5
Input Word
BR DM D
C
L
T
4
0
..
4
4
4
C
N
L
T
3
..
3
3
3
3
C
N
L
T
2
..
G
2
2
2
2
ATA5279N [Preliminary]
D
C
N
T
L
1
..
1
1
1
1
1
D
C
N
L
T
..
0
0
0
0
0
L
X
X
X
X
0
1..0
7
G
the required driver in the group
L
X
X
X
X
6
0
selects the driver group (0 for
6
L
X
X
X
X
5
0
5
Output Word
L
X
X
X
X
4
0
4
N
L
3
X
X
X
X
3
3
N
L
X
X
X
X
2
2
2
N
L
X
X
X
X
1
1
1
N
L
X
X
X
X
21
0
0