T5760-TGQ Atmel, T5760-TGQ Datasheet - Page 9

• Manufacturer Part Number: T5760-TGQ
• Description: IC RX 868MHZ ISM ASK/FSK 20-SOIC
• Manufacturer: Atmel

Specifications of T5760-TGQ

• Frequency: 868MHz
• Sensitivity: -110dBm
• Data Rate - Maximum: 10 kBaud
• Modulation Or Protocol: ASK, FSK
• Applications: General Purpose Data Transmission Systems
• Current - Receiving: 7.8mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: T5760-TGQTR

Polling Mode
Sleep Mode
4561B–RKE–10/02
I
•
•
•
The clock cycle of some function blocks depends on the selected baud-rate range
(BR_Range) which is defined in the OPMODE register. This clock cycle T
by the following formulas for further reference:
BR_Range = BR_Range0:
According to Figure 11, the receiver stays in polling mode in a continuous cycle of three
different modes. In sleep mode the signal processing circuitry is disabled for the time
period T
all signal processing circuits are enabled and settled. In the following bit-check mode,
the incoming data stream is analyzed bit by bit contra a valid transmitter signal. If no
valid signal is present, the receiver is set back to sleep mode after the period T
This period varies check by check as it is a statistical process. An average value for
T
consumption is I
The average current consumption in polling mode is dependent on the duty cycle of the
active mode and can be calculated as:
During T
tee the reception of a transmitted command the transmitter must start the telegram with
an adequate preburst. The required length of the preburst depends on the polling
parameters T
(T
(N
The following formula indicates how to calculate the preburst length.
T
The length of period T
the extension factor XSleep (according to Table 8), and the basic clock cycle T
calculated to be:
T
In US- and European applications, the maximum value of T
is set to 1. The time resolution is about 2 ms in that case. The sleep time can be
extended to almost half a second by setting XSleep to 8. XSleep can be set to 8 by bit
XSleep
According to Table 7, the highest register value of sleep sets the receiver into a perma-
nent sleep condition. The receiver remains in that condition until another value for Sleep
is programmed into the OPMODE register. This function is desirable where several
devices share a single data line and may also be used for microcontroller polling – via
Pin POLLING/_ON, the receiver can be switched on and off.
Spoll
Bit-check
Preburst
Sleep
Start_microcontroller
Bit-check
Application USA (f
Application Europe (f
Other applications The electrical characteristic is given as a function of T
=
= Sleep ´ X
Std
³ T
Sleep
I
------------------------------------------------------------------------------------------------------------- -
is given in the electrical characteristics. During T
Sleep
Soff
) to be tested.
to’1’.
Sleep
´
while consuming low current of I
and T
Sleep
BR_Range1:
BR_Range2:
BR_Range3:
T
T
Sleep
+ T
S
). Thus, T
Sleep
, T
Sleep
= I
Startup
Startup
Startup
Son
+
+
XTO
´ 1024 ´ T
Sleep
I
Son
T
. The condition of the receiver is indicated on Pin IC_ACTIVE.
+ T
XTO
the receiver is not sensitive to a transmitter signal. To guaran-
Startup
, T
= 7.14063 MHz, T
Bit-check
is defined by the 5-bit word Sleep of the OPMODE register,
´
Bit-check
Bit-check
= 6.77617 MHz, T
(
T
T
T
T
T
Startup
+
XClk
XClk
XClk
XClk
Clk
T
depends on the actual bit rate and the number of bits
Bit-check
and the start-up time of a connected microcontroller
+ T
= 8 ´ T
= 4 ´ T
= 2 ´ T
= 1 ´ T
+
Start_microcontroller
T
Bit-check
Clk
Clk
Clk
Clk
Clk
S
= I
Clk
= 1.961 µs)
)
Soff
= 2.066 µs)
. During the start-up period, T
Startup
Sleep
T5760/T5761
is about 60 ms if XSleep
and T
Bit-check
XClk
Clk
the current
is defined
.
Bit-check
Clk
Startup
. It is
9
,
.