ATA5279_10 ATMEL [ATMEL Corporation], ATA5279_10 Datasheet - Page 13

• Manufacturer Part Number: ATA5279_10
• Description: Antenna Driver for Multiple Antennas
• Manufacturer: ATMEL [ATMEL Corporation]

Table 3-3.
3.7
9125I–RKE–09/10
Step
1
2
3
4
5
6
7
8
SPI
Get Driver Setup
Get Driver Setup
Get Driver Setup
Sequence for Example 2, Using the Diagnosis Mode
Set Coil Current
Set Coil Current
- no command -
- no command -
Select Driver
Command
Again, this is only an example of how the diagnosis system can be used. Generally, a more
systematic approach is suggested in order to efficiently test all connection lines used.
Note:
The SPI is used to select the required coil and its current, to provide LF data to the IC, to
select and start an LF transmission, and to read out status information. It is equipped with a
chip select input to enable or disable communication. When disabled, the data output of the IC
is in high impedance mode, so other devices may communicate on the same bus.
The interface is configured as a slave device, always requiring a master (e.g., a microcon-
troller) for operation. The maximum input clock frequency is 1/4 of the system clock present at
the OSCI pin, resulting, for example, in a maximum signal speed of 2 Mbit/s when using a typ-
ical 8MHz input clock. The SPI features four different operation modes, which only differ in the
relationship between the clock signal (S_CLK) and the data I/Os.
Both the SPI itself and the corresponding I/O lines are supplied by the application-provided
logic supply voltage connected to the VIF pin. This ensures that the controller (master) and the
IC (slave) operate with the same voltage levels.
In total, four modes of operations are possible, each differing in clock polarity and phase.
Figure 3-7
To exit the diagnosis mode correctly, two SPI commands have to be sent: the first is the Select
Driver command with the DM bit set to 0 and the second is a Reset Fault Status command. See
also SPI Command Description.
I/O
O
O
O
I
I
I
I
I
I
and
Figure 3-8
00101101 – 2Dh
00011101 – 1Dh
10100010 – A2h
10100000 – A0h
01101000 – 68h
00011101 – 15h
01101000 – 68h
01101000 – 68h
00010101 – 15h
Coding
illustrate this.
Actions / Remarks
Selects driver 4 with Diagnosis Mode enabled
Reads back active driver info:
Channel 4 active, A4N returns a 1
Closes test switches S_L4P and S_H4N
Note:
Wait for the test structures to stabilize in the new setting, see
first example
Reads back active driver info:
Channel 4 active, both lines return a 1
Closes test switches S_L4P and S_L4N
Note:
Wait for the test structures to stabilize in the new setting, see
first example
Reads back active driver info:
Channel 4 active and A4N returns a 1
S_H4P and S_L4N are open then
S_H4P and S_H4N are open then
Atmel ATA5279
13