Datasheet > ATA6620_06

ATA6620_06

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
爱特美尔 - ATMEL		总线收发器稳压器
页数	文件大小	规格书
20页	326K
描述
LIN Bus Transceiver with Integrated Voltage Regulator

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ATA6620_06 数据手册

ATA6620

3. Functional Description

3.1

Supply Pin (VS)

LIN operating voltage is V_S= 5V to 18V. An undervoltage detection is implemented to disable

transmission if V_Sfalls below 5V, in order to avoid false bus messages. After switching on V_S,

the IC starts with the Pre-normal mode and the voltage regulator is switched on (that is,

5V/50 mA output capability).

The supply current in Sleep mode is typically 10 µA and 40 µA in Silent mode.

3.2

3.3

Ground Pin (GND)

The IC is neutral on the LIN pin in case of GND disconnection. It is able to handle a ground shift

up to 3V for supply voltage above 9V at the VS pin.

Voltage Regulator Output Pin (VCC)

The internal 5V voltage regulator is capable of driving loads with up to 50 mA, supplying the

microcontroller and other ICs on the PCB. It is protected against overload by means of current

limitation and overtemperature shut-down. Furthermore, the output voltage is monitored and will

cause a reset signal at the NRES output pin if it drops below a defined threshold V_thun

3.4

3.5

Undervoltage Reset Output (NRES)

This push-pull output is supplied from the V_CCvoltage. If the V_CCvoltage falls below the under-

voltage detection threshold of V_thun, NRES switches to low after tres_f (Figure 4-6 on page 9).

Even if V_CC= 0V the NRES stays low, because it is internally driven from the V_Svoltage. If V_S

voltage ramps down, NRES stays low until V_S< 1.5V and then becomes highly resistant.

The implemented undervoltage delay keeps NRES low for t_Reset= 10 ms after V_CCreaches its

nominal value.

Bus Pin (LIN)

A low-side driver with internal current limitation and thermal shutdown, as well as an internal

pull-up resistor according to LIN specification 2.0 is implemented. The voltage range is from

–40V to +60V. This pin exhibits no reverse current from the LIN bus to V_S, even in the case of a

GND shift or V_Battdisconnection. The LIN receiver thresholds are compatible with the LIN proto-

col specification.

The fall time (from recessive to dominant) and the rise time (from dominant to recessive) are

slope controlled. The output has a short-circuit limitation. This is a self-adapting current limita-

tion; that is, during current limitation, as the chip temperature increases, the current decreases.

3.6

Input Pin (TXD)

This pin is the microcontroller interface to control the state of the LIN output. TXD must be pulled

to ground in order to drive the LIN bus low. If TXD is high or unconnected (internal pull-up resis-

tor), the LIN output transistor is turned off and the bus is in the recessive state.

4850D–AUTO–02/06

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