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參數(shù)資料
| 型號： | ATA6620-TASY |
| 廠商： | Atmel |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LIN BUS 5V/50MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 112 |
| 類型： | 收發(fā)器 |
| 規(guī)程： | LIN |
| 電源電壓： | 5 V ~ 18 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
11
4850I–AUTO–09/09
ATA6620N
4.4
Unpowered Mode
If battery voltage is connected to the application circuit (see Figure 4-7), the voltage at the VS
pin increases due to the block capacitor. When V
S is higher than the VS undervoltage threshold,
V
Sth, the IC-mode changes from Unpowered to Pre-normal mode. The VCC output voltage
reaches nominal value after t
VCC. This time depends on the VCC capacitor and the load.
NRES is low for the reset time delay t
Reset; no mode change is possible during this time.
Figure 4-7.
V
CC Voltage Regulator: Ramp Up and Undervoltage
5.
Fail-safe Features
During a short circuit at LIN, the output limits the output current to I
BUS_LIM. Due to the power
dissipation, the chip temperature exceeds t
LINoff and the LIN output is switched off. The chip
cools down and after a hysteresis of t
hys, switches the output on again. During LIN
overtemperature switch-off, the V
CC regulator works independently.
There are now reverse currents < 3 A at pin LIN during loss of V
Batt or GND. This is optimal
behavior for bus systems where some slave nodes are supplied from battery or ignition.
During a short circuit at VCC, the output limits the output current to I
VCCn. Because of
undervoltage, NRES switches to low and sends a reset to the microcontroller. The IC
switches into Pre–normal mode. If the chip temperature exceeds the value t
VCCoff, the VCC
output switches off. The chip cools down and after a hysteresis of t
hys, switches the output on
again. Because of Pre-normal mode, the V
CC voltage will switch on again although EN is
switched off from the microcontroller.The microcontroller can then start with normal
operation.
Pin EN provides a pull-down resistor to force the transceiver into recessive mode if EN is
disconnected.
Pin RXD is set floating if V
Batt is disconnected.
Pin TXD provides a pull-up resistor to force the transceiver into recessive mode if TXD is
disconnected.
VS
5.5V
12V
3V
VCC
5V
NRES
5V
Vthun
tres
tes_f
tVCC
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