MCP2025-330ESLASHP datasheet(3/36 Pages) MICROCHIP

3 / 36 page

 2012 Microchip Technology Inc.

DS22306A-page 3

MCP2025

1.0

FUNCTION DESCRIPTION

The MCP2025 provides a physical interface between a

microcontroller and a LIN half-duplex bus. It is intended

for automotive and industrial applications with serial

bus baud rates up to 20 kbaud. This device will

translate the CMOS/TTL logic levels to LIN logic levels,

and vice versa. The device offers optimum EMI and

ESD performance; it can withstand high voltage on the

LIN bus. The device supports two low-power modes to

meet

automotive

industry

power

consumption

requirements. The MCP2025 also provides a +5V or

3.3V 70 mA regulated power output.

1.1

Modes of Operation

The MCP2025 works in five modes: POWER-ON-

RESET mode, POWER-DOWN mode, READY mode,

OPERATION mode, and TRANSMITTER-OFF mode.

For an overview of all operational modes, please refer

to Table 1-1. For the operational mode transition,

please refer to Figure 1-1.

FIGURE 1-1:

STATE DIAGRAM

1.1.1

POWER-ON-RESET MODE

Upon application of VBB, or whenever the voltage on

VBB is below the threshold of regulator turn off voltage

VOFF (typically 4.50V), the device enters POWER-ON-

RESET mode (POR). During this mode, the device

maintains the digital section in a reset mode and waits

until the voltage on pin VBB rises above the threshold

of regulator turn on voltage VON (typically 5.75V) to

enter READY mode. In POWER-ON-RESET mode,

the LIN physical layer and voltage regulator are

disabled, and the RESET pin is switched to ground.

POR

(2)

VREG OFF

RX OFF

TX OFF

READY

VREG ON

RX ON

TX OFF

VREG ON

RX ON

TX OFF

POWER-DOWN

VREG OFF

RX OFF

TX OFF

OPERATION

VREG ON

RX ON

TX ON

VBB>VON

CS/LWAKE=0

&TXD=0

CS/LWAKE=1 &TXD=1

VREG_OK=1

(1)

CS/LWAKE=1&

TXD=1&

No Fault

(3)

CS/LWAKE=0 or

Fault detected

(3)

CS/LWAKE=1 OR

Voltage Rising Edge on LBUS

CS/LWAKE=0

CS=1 &TXD=0&

VREG_OK=1

(1)

Note 1:

VREG_OK : Regulator Output Voltage > 0.8VREG_NOM.

If the voltage on pin VBB falls below VOFF, the device will enter POWER-ON RESET mode from all other

modes, which is not shown in the figure.

Faults include TXD/LBUS permanent dominant, LBUS short to VBB, thermal protection, and VREG_OK

is false.

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