Rainbow Electronics ATA5812 - Manual (Page 32)

32
ATA5811/ATA5812 [Preliminary]
4689B–RKE–04/04
2-Battery Application The supply voltage range is 4.4 V to 6.6 V and VAUX is connected to an inductive
supply.
Figure 26. 2-Battery Application with Inductive Emergency Supply
Microcontroller
Interface
The microcontroller interface is a level converter which converts all internal digital sig-
nals which are re ferre d to the DVCC voltage , in to the voltag e used by th e
microcontroller. Therefore, the pin VSINT has to be connected to the supply voltage of
the microcontroller.
This makes it possible to use the internal voltage regulator/switch at pin VSOUT as in
Figure 4 on page 6 and Figure 6 on page 8 or to connect the microcontroller and the pin
VSINT directly to the supply voltage of the microcontroller as in Figure 5 on page 7.
Digital Control Logic
Register Structure The configuration of the transceiver is stored in RAM cells. The RAM contains a
16
×
8-bit TX/RX data buffer and a 6
×
8-bit control register and is write and readable
via a 4-wire serial interface (CS, SCK, SDI_TMDI, SDO_TMDO).
The 1
×
8-bit status register is not part of the RAM and is readable via the 4-wire serial
interface.
The RAM and the status information is stored as long as the transceiver is in any active
mode (DVCC = VS1 or DVCC = V_REG2) and gets lost if the transceiver is in OFF
mode (DVCC = OFF).
VS1
VS2
VAUX
Microcontroller ATA5811/ATA5812
4.4 V to 6.6 V
VSOUT
VSINT
VS
AVCC
DVCC
CS
SCK
SDI_TMDI
SDO_TMDO
IRQ
CLK
NRESET
OUT
OUT
OUT
IN
IN
IN
IN
M
ic
roc
ont
ol
le
r_I
n
te
rf
ac
e
DEM_OUT
RF - Transceiver
Digital Control
Logic