ATA6622-EK Atmel, ATA6622-EK Datasheet - Page 13

• Manufacturer Part Number: ATA6622-EK
• Description: BOARD DEMO LIN SBC FOR ATA6622
• Manufacturer: Atmel

Specifications of ATA6622-EK

• Main Purpose: Interface, LIN
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6622
• Primary Attributes: LIN-SBC (System-Basis-Chip) Transceiver, LIN 2.0, Voltage Regulator, Window Watchdog
• Secondary Attributes: 4 Power Modes: Pre-Normal, Normal, Sleep, Silent, 20-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.5
5.6
4986J–AUTO–03/11
Fail-safe Features
Voltage Regulator
The voltage regulator needs an external capacitor for compensation and for smoothing the
disturbances from the microcontroller. It is recommended to use an electrolythic capacitor with
C > 1.8µF and a ceramic capacitor with C = 100nF. The values of these capacitors can be
varied by the customer, depending on the application.
The main power dissipation of the IC is created from the VCC output current I
needed for the application. In
ATA6624/ATA6626 is shown.
• During a short-circuit at LIN to V
• During a short-circuit from LIN to GND the IC can be switched into Sleep or Silent Mode. If
• The reverse current is very low < 2µA at the LIN pin during loss of V
• During a short circuit at VCC, the output limits the output current to I
• EN pin provides a pull-down resistor to force the transceiver into recessive mode if EN is
• RXD pin is set floating if V
• TXD pin provides a pull-up resistor to force the transceiver into recessive mode if TXD is
• If TXD is short-circuited to GND, it is possible to switch to Sleep Mode via ENABLE after
• If the WD_OSC pin has a short-circuit to GND and the NTRIG Signal has a period time
• If the resistor at WO_OSC pin is disconnected, the watchdog runs with an internal oscillator
the power dissipation, the chip temperature exceeds T
off. The chip cools down and after a hysteresis of T
stays on high because LIN is high. During LIN overtemperature switch-off, the VCC
regulator works independently.
the short-circuit disappears, the IC starts with a remote wake-up.
behavior for bus systems where some slave nodes are supplied from battery or ignition.
undervoltage, NRES switches to low and sends a reset to the microcontroller. The IC
switches into Fail-safe Mode. If the chip temperature exceeds the value T
output switches off. The chip cools down and after a hysteresis of T
on again. Because of the Fail-safe Mode, the VCC voltage will switch on again although EN
is switched off from the microcontroller. The microcontroller can start with its normal
operation.
disconnected.
disconnected.
t
> 27ms, the watchdog runs with an internal oscillator and guarantees a reset after the
second NTRIG signal at the latest.
and guarantees a reseet after the second NTRIG signal at the latest.
dom
> 20ms (only for Atmel
Atmel ATA6622/ATA6624/ATA6626
Batt
®
Figure 5-2 on page 14
ATA6622/ATA6624).
is disconnected.
Battery
, the output limits the output current to I
hys
the safe operating area of the Atmel
, switches the output on again. RXD
LINoff
, and the LIN output is switched
hys
Batt
VCClim
, switches the output
. This is optimal
VCCoff
. Because of
BUS_lim
VCC
, the VCC
, which is
. Due to
13