ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 211

• Manufacturer Part Number: ATA6616-P3PW
• Description: TXRX MULTICHIP MOD LIN SIP 38QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6616-P3PW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.17
4.17.1
4.17.2
4.17.2.1
9132D–AUTO–12/10
ISRC - Current Source
Features
Typical Applications
LIN Current Source
•
•
The Atmel
is flowing through an external resistor. The voltage can be measured on the dedicated pin
shared with the ADC. Using a resistor in series with a
protect the device against big values, the ADC must be configured with AVcc as internal refer-
ence to perform the first measurement. Afterwards, another internal reference can be chosen
according to the previous measured value to refine the result.
When ISRCEN bit is set, the ISRC pin sources 100µA. Otherwise this pin keeps its initial
function.
Figure 4-81. Current Source Block Diagram
During the configuration of a LIN node in a cluster, it may be necessary to attribute dynami-
cally an unique physical address to every cluster node. The way to do it is not described in the
LIN protocol.
The Current Source offers an excellent solution to associate a physical address to the applica-
tion supported by the LIN node. A full dynamic node configuration can be used to set-up the
LIN nodes in a cluster.
Atmel ATtiny87/167 proposes to have an external resistor used in conjunction with the Current
Source. The device measures the voltage to the boundaries of the resistance via the Analog to
Digital converter. The resulting voltage defines the physical address that the communication
handler will use when the node will participate in LIN communication.
In automotive applications, distributed voltages are very disturbed. The internal Current
Source solution of Atmel ATtiny87/167 immunizes the address detection the against any kind
of voltage variations.
100µA Constant current source
±10% Absolute Accuracy
®
ATtiny87/167 features a 100µA ±10% Current Source. Up on request, the current
ADC Input
100 uA
AVCC
ISRCEN
Atmel ATA6616/ATA6617
ADCn/ ISRC
0.5% tolerance is recommended. To
External
Resistor
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