ATA6620 데이터 시트보기 (PDF) - Atmel Corporation
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ATA6620 Datasheet PDF : 20 Pages
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3.7 Dominant Time-out Function (TXD)
The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from being
driven permanently in the dominant state. If TXD is forced to low longer than TDOM > 4 ms, the
LIN bus driver is switched to the recessive state. To reset this dominant time-out mode, TXD
must be switched to high (>10 µs) before normal data transmission can be started.
3.8 Output Pin (RXD)
This pin reports the state of the LIN bus to the microcontroller. LIN high (recessive state) is
reported by a high level at RXD; LIN low (dominant state) is reported by a low level at RXD. The
output has an internal pull-up structure with typically 5 kΩ to VCC. The AC characteristics are
measured with an external load capacitor of 20 pF.
The output is short-circuit protected. In unpowered mode (that is, VS = 0V), RXD is switched off.
3.9 Enable Input Pin (EN)
This pin controls the operation mode of the interface. After power up of VS (battery), the IC
switches to Pre-normal mode, even if EN is low or unconnected (internal pull-down resistor). If
EN is high, the interface is in Normal mode.
A falling edge at EN while TXD is still high forces the device to Silent mode. A falling edge at EN
while TXD is low forces the device to Sleep mode.
4. Mode of Operation
Figure 4-1. Mode of Operation
Unpowered Mode
VBatt = 0
b
a
a: VS > 5V
b: VS < 4V
c: Bus wake-up event
d: NRES switches to low
Pre-normal Mode
VCC: 5V/2%/50 mA with undervoltage
b
monitoring
Communication: OFF
d
EN = 1
Normal Mode
VCC: 5V/2%/50 mA
with undervoltage
monitoring
Communication: ON
EN = 0
TXD = 1
EN = 1
EN = 0
TXD = 0
EN = 1
Go to silent command
Local wake-up event
Go to sleep command
Local wake-up event
b
c+d
c
b
Silent Mode
VCC: 5V/7%/50 mA
with undervoltage monitoring
Communication: OFF
Sleep Mode
VCC: switched off
Communication: OFF
4 ATA6620
4850D–AUTO–02/06
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