MCP79411 datasheet(8/60 Pages) MICROCHIP

8 / 60 page

MCP79410/MCP79411/MCP79412

DS20002266E-page 8

 2010-2013 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN DESCRIPTIONS

FIGURE 3-1:

DEVICE PINOUTS

3.1

Serial Data (SDA)

This is a bidirectional pin used to transfer addresses

and data into and out of the device. It is an open-drain

terminal, therefore, the SDA bus requires a pull-up

resistor to VCC (typically 10 k

 for 100 kHz, 2 k for

400 kHz). For normal data transfer, SDA is allowed to

change only during SCL low. Changes during SCL high

are reserved for indicating the Start and Stop

conditions.

3.2

Serial Clock (SCL)

This input is used to synchronize the data transfer from

and to the device.

3.3

X1, X2

External crystal pins for 32.768 kHz crystal and load

capacitors.

X1 = Oscillator input, also external oscillator input

X2 = Oscillator output

3.4

MFP (Multifunction Pin)

Open drain pin used for alarm and clock-out, addition-

ally the state of this pin may be changed using the OUT

bit. This pin is also controlled by the oscillator bit. See

Section 8.5 “Multifunction PIN (MFP)” for more

details. This pin may be left floating if not used.

3.5

VBAT

Input for backup supply to maintain RTCC and SRAM

during the time when VCC is below VTRIP. See

Section 8.6 “Battery Backed Operation” for more

details.

Name

Pin Function

Number

Xtal Input, External Oscillator Input

Xtal Output

VBAT

Battery Backup Input

Vss

Ground

SDA

Bidirectional Serial Data (I2C™)

SCL

Serial Clock (I2C)

MFP

Multifunction Pin

Vcc

Power Supply

Note:

Exposed pad on TFDN can be connected to

Vss or left floating.

VBAT

Vss

Vcc

MFP

SCL

SDA

SOIC/TDFN/MSOP/TSSOP

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