MCP2003 datasheet(8/32 Pages) MICROCHIP

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MCP2003/4

DS22230A-page 8

 2010 Microchip Technology Inc.

1.5

Pin Descriptions

TABLE 1-1:

PINOUT DESCRIPTIONS

1.5.1

RECEIVE DATA OUTPUT (RXD)

The Receive Data Output pin is a open drain (OD)

output and follows the state of the LIN pin.

1.5.2

CS (CHIP SELECT)

Chip Select Input pin. An internal pull-down resistor will

keep the CS pin low. This is done to ensure that no

disruptive data will be present on the bus while the

microcontroller is executing a Power-on Reset and an

I/O initialization sequence. The pin must detect a high

level to activate the transmitter.

If CS = 0 when the VBB supply is turned on, the device

stays in Ready mode. In Ready mode, the receiver is

on and the LIN transmitter driver is off.

If CS = 1 when the VBB supply is turned on, the device

will proceed to the Operation mode as soon as internal

voltages stabilize.

This pin may also be used as a local wake-up input

(Refer to Example 1-1). In this implementation, the

microcontroller I/O controlling the CS should be

converted to a high-impedance input allowing the

internal pull-down resistor will keep CS low. An external

switch, or other source, can then wake-up both the

transceiver and the microcontroller (if powered).

1.5.3

WAKE UP INPUT (WAKE)

This pin is only available on the MCP2003.

The WAKE pin has an internal 800K pull up to VBB. A

falling edge on the WAKE pin causes the device to

wake from Power Down mode. Upon waking, the

MCP2003 will enter Ready mode

1.5.4

FAULT/TXE

This pin is only available on the MCP2004. This pin is

bidirectional and allows disabling of the transmitter, as

well as fault reporting related to disabling the

transmitter. This pin is an open-drain output with states

as defined in Table 1-2. The transmitter is disabled

whenever this pin is low (‘0’), either from an internal

Fault condition or by an external drive. While the

transmitter is disabled, the internal 30 k

 pull-up

resistor on the LBUS pin is also disconnected to reduce

current.

Pin Name

8-Pin

PDIP,

SOIC

8-Pin

DFN

MCP2003

MCP2004

Normal Operation

RXD

Receive Data Output (OD)

Chip Select (TTL)

Chip Select/Local WAKE (TTL)

WAKE (MCP2003 only)

FAULT/TXE (MCP2004

only)

Wake up, HV tolerant

Fault Detect Output (OD)

Transmitter Enable (TTL)

TXD

Transmit Data Input (TTL)

VSS

Ground

LBUS

LIN bus (bidirectional)

VBB

Battery positive

VREN

Voltage Regulator Enable Output Voltage Regulator Enable Output

—

Exposed Thermal Pad. Do not

electrically connect or connect to

Vss

Exposed Thermal Pad. Do not

electrically connect or connect to

Vss

Legend: TTL = TTL Input Buffer; OD = Open-Drain Output

Note:

It is not recommended to tie CS high as

this can result the MCP2003/4 entering

Operation mode before the microcon-

troller is initialized and may result in

unintentional LIN traffic.

Note:

The FAULT/TXE pin is true (‘0’) whenever

the internal circuits have detected a short

or thermal excursion and have disabled

the LBUS output driver.

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