ATA5811-PLQX Atmel, ATA5811-PLQX Datasheet - Page 48

• Manufacturer Part Number: ATA5811-PLQX
• Manufacturer: Atmel

Specifications of ATA5811-PLQX

• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 7mm
• Product Height (mm): 0.9mm
• Product Length (mm): 7mm
• Lead Free Status / Rohs Status: Compliant

Operation Modes
RX Operation
RX Polling Mode
48
ATA5811/ATA5812 [Preliminary]
The transceiver is set to RX operation with the bits OPM0 and OPM1 in control
register 1
.
Table 37. Control Register 1
The transceiver is designed to consume less than 1 mA in RX operation while being
sensitive to signals from a corresponding transmitter. This is achieved via the polling cir-
cuit. This circuits enables the signal path periodically for a short time. During this time
the Bit-check logic verifies the presence of a valid transmitter signal. Only if a valid sig-
nal is detected the transceiver remains active and transfers the data to the connected
microcontroller. This transfer take place either via the TX/RX data buffer or via the pin
SDO_TMDO. If there is no valid signal present the transceiver is in sleep mode most of
the time resulting in low current consumption. This condition is called RX polling mode.
A connected microcontroller can be disabled during this time.
All relevant parameters of the polling logic can be configured by the connected micro-
controller. This flexibility enables the user to meet the specifications in terms of current
consumption, system response time, data rate etc.
In RX mode the RF transceiver is enabled permanently and the Bit-check logic verifies
the presence of a valid transmitter signal. If a valid signal is detected the transceiver
transfers the data to the connected microcontroller. This transfer take place either via
the TX/RX data buffer or via the pin SDO_TMDO.
If the transceiver is in RX polling mode it stays in a continuous cycle of three different
modes. In sleep mode the RF transceiver is disabled for the time period T
suming low current of I
T
Bit-check mode, the incoming data stream is analyzed bit by bit contra a valid transmit-
ter signal. If no valid signal is present, the transceiver is set back to sleep mode after the
period T
age value for T
current consumption is I
sumption is I
RX_ACTIVE (see Figure 40 on page 50 and Figure 41 on page 51). The average cur-
rent consumption in RX polling mode I
application or car application. To calculate I
1 battery application, VS2 in 2 battery application or VS2, VAUX in car application (see
section “Electrical Characteristics”).
Startup_Sig_Proc
I
P
=
Bit-check
I
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
IDLE_X
OPM1
1
1
S
, all signal processing circuits are enabled and settled. In the following
. This period varies check by check as it is a statistical process. An aver-
= I
Bit-check
T
Startup_Sig_Proc_X
Sleep
is given in the electrical characteristics. During T
+
T
S
I
Sleep
Startup_PLL_X
S
= I
= I
RX_X
+
I DL E_ X
T
Startup_PLL
. The condition of the transceiver is indicated on pin
. During T
OPM0
. During the start-up period, T
0
1
T
P
Startup_PLL
is different in 1 battery application, 2 battery
+
P
T
Startup_Sig_Proc
the index X must be replaced by VS1, 2 in
Startup_Sig_Proc
+
I
RX_X
and T
+
T
T
Startup_Sig_Proc
Bit_check
RX polling mode
Bit-check
Function
RX mode
the current con-
St a rt u p _P L L
Sleep
+
4689B–RKE–04/04
Startup_PLL
T
Bitcheck
while con-
and
the