MCP79511 datasheet(6/50 Pages) MAS

6 / 50 page

MCP7952X/MCP7951X

DS22300A-page 6

Preliminary

 2012 Microchip Technology Inc.

2.0

PIN DESCRIPTION

The descriptions of the pins are listed in Table 2-1.

FIGURE 2-1:

DEVICE PINOUTS

2.1

Chip Select (CS)

A low level on this pin selects the device. A high level

deselects the device and forces it into Standby mode.

However, a programming cycle which is already initi-

ated or in progress will be completed, regardless of the

CS input signal. If CS is brought high during a program

cycle, the device will go in Standby mode as soon as

the programming cycle is complete. When the device is

deselected, SO goes into the high-impedance state,

allowing multiple parts to share the same SPI bus. A

low-to-high transition on CS after a valid write

sequence initiates an internal write cycle. After power-

up, a low level on CS is required prior to any sequence

being initiated.

2.2

Serial Output (SO)

The SO pin is used to transfer data out of the

MCP795XX. During a read cycle, data is shifted out on

this pin after the falling edge of the serial clock.

2.3

Serial Input (SI)

The SI pin is used to transfer data into the device. It

receives instructions, addresses and data. Data is

latched on the rising edge of the serial clock.

2.4

Serial Clock (SCK)

The SCK is used to synchronize the communication

between a master and the MCP795XX. Instructions,

addresses or data present on the SI pin are latched on

the rising edge of the clock input, while data on the SO

pin is updated after the falling edge of the clock input.

2.5

Multifunction Pin (MFP)

The MFP pin is shared with the clock divider and the

alarms. This pin requires an external pull-up to VCC or

VBAT. The pin remains low until such time that the inter-

rupt flag in the register is cleared by software. This pin

has a maximum sink current of 10mA.

2.6

X1, X2

The X1 and X2 pins connect to the on-board oscillator

block. X1 is the input to the module and X2 is the out-

put of the module. The device can be run from an

external CMOS signal by feeding into the X1 pin. If

driving X1 the X2 pin should be a No Connect.

2.7

VBAT

The VBAT pin is a secondary supply input to maintain

the Clock and SRAM contents when VCC is removed.

TABLE 2-1:

PIN DESCRIPTIONS

VBAT

Vcc

MFP

MSOP/TDFN

VSS

SCK

Pin Name

Pin Function

VSS

Ground

Xtal Input, External Oscillator Input

Xtal Output

VBAT

Battery Backup Input (3V Typ)

VCC

+1.8V to +3.6V Power Supply

Serial Input

SCK

Serial Clock

Chip Select

MFP

Multifunction Pin

Serial Output

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