ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 211
ATA6616-P3PW
Manufacturer Part Number
ATA6616-P3PW
Description
TXRX MULTICHIP MOD LIN SIP 38QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6617-EK.pdf
(308 pages)
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
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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
211
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