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參數(shù)資料
| 型號： | T5761-TG |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | UHF ASK/FSK Receiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 765K |
| 代理商： | T5761-TG |
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T5761
T5760 /
Preliminary Information
Rev. A2, 19-Oct-00
7 (32)
ing 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 af-
ter the period T
Bit-check
. This period varies check by
check as it is a statistical process. An average value for
T
Bit-check
is given in the electrical characteristics. During
T
Startup
and T
Bit-check
the current consumption is I
S
= I
Son
.
The condition of the receiver is indicated on Pin IC_AC-
TIVE. The average current consumption in polling mode
is dependent on the duty cycle of the active mode and can
be calculated as:
I
Spoll
I
Soff
T
Sleep
T
Sleep
I
Son
T
Startup
(T
Startup
T
Bitcheck
)
T
Bitcheck
During T
Sleep
and T
Startup
the receiver is not sensitive to
a transmitter signal. To guarantee the reception of a trans-
mitted command the transmitter must start the telegram
with an adequate preburst. The required length of the
preburst depends on the polling parameters T
Sleep
,
T
Startup
, T
Bit-check
and the start-up time of a connected
μ
C
(T
Start,
μ
C
). Thus, T
Bit-check
depends on the actual bit rate
and the number of bits (N
Bit-check
) to be tested.
The following formula indicates how to calculate the
preburst length.
T
Preburst
Sleep Mode
T
Sleep
+ T
Startup
+ T
Bit-check
+ T
Start_ C
The length of period T
Sleep
is defined by the 5-bit word
Sleep of the OPMODE register, the extension factor
XSleep (according to table 9),
and the basic clock cycle
T
Clk
. It is calculated to be:
T
Sleep
= Sleep
X
Sleep
1024
In US- and European applications, the maximum value of
T
Sleep
is about 60 ms if XSleep is set to 1. The time reso-
lution 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
Std
to
’
1
’
.
According to table 8, the highest register value of sleep
sets the receiver into a permanent sleep condition. The re-
ceiver 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
μ
C polling
–
via Pin
POLLING/_ON, the receiver can be switched on and off.
T
Clk
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