ATA6662-EK Atmel, ATA6662-EK Datasheet - Page 3

• Manufacturer Part Number: ATA6662-EK
• Description: BOARD EVALUATION FOR ATA6662
• Manufacturer: Atmel

Specifications of ATA6662-EK

• Main Purpose: Interface, LIN
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6662
• Primary Attributes: LIN Transceiver, LIN 2.0, SAEJ2602-2
• Secondary Attributes: 4 Power Modes: Pre-Normal, Normal, Sleep, 8-SOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

2. Hardware Description
2.1
2.2
2.2.1
2.2.2
2.2.3
4968B–AUTO–03/11
Power Supply (VBAT, +5V and GND)
LIN Interface (LIN, TXD and RXD)
Bus Pin (LIN)
Input Pin (TXD)
Output Pin (RXD)
In the following sections only the normal operating conditions will be described. For detailed
information concerning the mentioned features, refer to the corresponding datasheet.
The development board requires an external 5.7V to 18V DC power supply between the termi-
nals VBAT and GND. The input circuit is protected against inverse-polarity with the protection
diode D1, so that there is normally a difference between the VBAT and VS level of approxi-
mately 0.7V.
The DC voltage at pin +5V is only needed when the pull-up resistor for the pin RXD is to be
activated.
A low-side driver with internal current limitation, thermal shutdown, and an internal pull-up
resistor in compliance with LIN spec 2.0 is implemented. LIN receiver thresholds are compati-
ble to the LIN protocol specification.
On the board at the LIN pin there is a 220-pF capacitor to ground. Additionally, the two extra
components (diode D2 (LL4148) in series with resistor R3 (1 k )) necessary to use the devel-
opment board for a LIN master application have designated placeholders for convenient
mounting.
This pin is the microcontroller interface to control the state of the LIN output. TXD must be
pulled to ground in order to have the LIN bus low. If TXD is high, the LIN output transistor is
turned off and the bus is in the recessive state, pulled up by the internal resistor. If TXD is low,
the LIN output transistor is turned on and the bus is in the dominant state. An internal timer
prevents the bus line from being driven permanently in the dominant state. If TXD is forced to
low longer than t
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 is short-circuit protected.
Please note that the Atmel
communication via LIN enabled.
DOM
> 20 ms, the LIN bus driver is switched to the recessive state.
®
ATA6661/ATA6662 has to be in normal mode in order to have the
Atmel ATA6661/ATA6662
3