ATA5279_10 ATMEL [ATMEL Corporation], ATA5279_10 Datasheet - Page 16

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

Table 3-4.
3.8
3.8.1
16
Note:
S
P
C
o
n
I
t
r
S_CLK
Name
NRES
BCNT
MACT
S_CS
MOSI
MISO
IRQ
VIF
Command Buffer
1. State dependant on modulation, chip state or SPI data
Atmel ATA5279
Structure
States of Control I/Os
Pin # Direction
38
39
37
36
40
41
10
6
9
Push-pull
Push-pull
Push-pull
Push-pull
output
output
output
output
Input
Input
Input
Input
Input
This buffer is a First-In-First-Out (FIFO)-type buffer, located between the SPI and the modula-
tor stage. The microcontroller can write coil-driving related commands and data with full SPI
speed to keep the CPU and bus load low.
The buffer can store up to 128bits, organized in 16 words, each eight bit in size. Hence, each
data word from the SPI that contains a control command for the driver stages (i.e., select a
certain driver, select a certain current, transmit LF-data bits and transmit a constant wave) is
stored in a buffer word.
Low/High (S_CS = high)
Tristate (S_CS = low)
Transmission Mode
Entering by SPI cmd
Weak-pull-down
High impedance
High impedance
Supply current
Weak-pull-up
Operation/
Low/high
Low/high
High
(1)
(1)
Figure 3-11
Low/High (S_CS = high)
Tristate (S_CS = low)
Fault has detected
Shutdown Mode
Weak-pull-down
High impedance
High impedance
Supply current
Weak-pull-up
Low/high
Low
Low
outlines this.
(1)
Low/high (S_CS = high)
Tristate (S_CS = low)
Entering by S_CS
Weak-pull-down
High impedance
High impedance
Supply current
Weak-pull-up
Low/high
Idle Mode
Low
Low
(1)
Low/high (S_CS = high)
Tristate (S_CS = low)
Entering by NRES or
Power Down/Reset
High impedance
High impedance
Weak-pull-down
Supply current
Weak-pull-up
POC
High
9125I–RKE–09/10
Low
Low