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參數(shù)資料
| 型號： | U6812B |
| 廠商： | ATMEL CORP |
| 元件分類： | Line Driver or Receiver |
| 英文描述： | LINE TRANSCEIVER, PDSO16 |
| 封裝： | 0.150 INCH, SOP-16 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 137K |
| 代理商： | U6812B |
4
U6812B
4760A–AUTO–10/03
Functional Description
K-interface
The K-interface is equipped with a 40-mA open-collector driver. The current is deter-
mined by the external pull-up resistor. The saturation voltage is below 0.6 V.
The open-collector output is protected by a 28-V Z-diode. The collector current is per-
manently monitored for short circuits via a built-in shunt. In the event of a short circuit
occurring at V
Batt
, the collector current is held at approximately I
creg
= 80 mA; the chip
temperature then rises due to power loss. This status is maintained until the detection of
overtemperature which causes the K-line output to be disabled and stored to memory.
The internal short-circuit detection threshold is I
sc
> 0.8 I
creg
. The output remains dis-
abled until a falling edge of a pulse is available to its input. Any further attempt to
connect while the short circuit is still present causes the above sequence to be
repeated. The output can be activated normally once the short circuit has been
removed. The maximum baud rate is 250 kBaud.
The K-line allows bi-directional communication with the microcontroller. When the out-
put K is disabled, information can be transferred to the processor via the input
comparator at pin RxD.
The digital output RxD is a push-pull output stage with a driver power of 1 mA.
In the event of a line break at the K-line, the output K is connected to GND via the built-
in 85-k pull-down resistor, thus allowing the microcontroller to detect this fault. The
maximum sampling frequency is 250 kBaud.
Open-collector Driver
OUTx
The outputs are designed for a maximum static current of 40 mA, which is determined
by the external pull-up resistor. The saturation voltage is below 0.6 V
The three OUTx-driver outputs are activated with "active low" at the corresponding
input. Outputs OUT2 and OUT3 can also be disabled with "active low" at the disable
input, regardless of their input signal. The outputs are released by an open disable input
or by using high potential.
The open-collector outputs are connected to a 28-V Z-diode. The collector current is
permanently monitored via a built-in shunt circuit to permit the detection of short circuits.
If a short circuit occurs at V
Batt
, the collector current is held at approximately
I
creg
= 80 mA; accompanied with a rise of chip temperature due to power loss. This sta-
tus is maintained until the detection of overtemperature which causes the output
affected by the short circuit to be selectively disabled and stored to memory. The inter-
nal short-circuit detection threshold is I
sc
> 0.8 I
creg
. The affected output remains
disabled until a falling edge of a pulse is available to its input. Any further attempt to con-
nect while the short circuit is still present causes the above sequence to be repeated.
The output can be activated normally once the short circuit has been removed.
Power Supply
The IC must be equipped with external RC circuitry to limit the voltage in the event of
power surges (see Figure 3 on page 3). This prevents the circuit from being damaged or
destroyed, and provides a buffer in case of power fluctuations at V
Batt
. The RxD compar-
ator is powered via pin V
S
, producing its reference voltage of 1/2 V
S
, while all other
blocks are supplied via V
CC
.
The operating voltage can vary between V
S
= 7 V and 26 V. The resistor R
1
at pin V
S
lim-
its the current via the built-in 28-V Z-diode between V
S
and GND.
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