MCP79522-ISLASHMS datasheet(9/58 Pages) MICROCHIP

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DS20002300D-page 9

MCP7951X/MCP7952X

3.0

PIN DESCRIPTIONS

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

3.1

Oscillator Input/Output (X1, X2)

These pins are used as the connections for an external

32.768 kHz quartz crystal and load capacitors. X1 is

the crystal oscillator input and X2 is the output. The

MCP795XX is designed to allow for the use of external

load capacitors in order to provide additional flexibility

when choosing external crystals. The MCP795XX is

optimized for crystals with a specified load capacitance

of 6-9 pF.

X1 also serves as the external clock input when the

MCP795XX is configured to use an external oscillator.

3.2

Backup Supply (VBAT)

This is the input for a backup supply to maintain the

RTCC and SRAM registers during the time when VCC

is unavailable.

Power should be applied to VCC before VBAT.

If the battery backup feature is not being used, the

VBAT pin should be connected to VSS.

3.3

Chip Select (CS)

A low level on this pin selects the device, whereas a

high level deselects the device. A nonvolatile memory

programming cycle which is already initiated or in

progress will be completed, regardless of the CS input

signal. When the device is deselected, SO goes into

the high-impedance state, allowing multiple parts to

share the same SPI bus. After power-up, a high-to-low

transition on CS is required prior to any sequence

being initiated.

3.4

Serial Input (SI)

This 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.

3.5

Serial Output (SO)

This 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.

3.6

Serial Clock (SCK)

This pin is used to synchronize the communication

between a host 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.

3.7

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

interrupt flag in the register is cleared by software. This

pin has a maximum sink current of 10 mA.

TABLE 3-1:

PIN FUNCTION TABLE

Name

10-Pin MSOP

10-Pin TDFN(1)

Pin Function

Quartz Crystal Input, External Oscillator Input

Quartz Crystal Output

VBAT

Battery Backup Supply Input

Chip Select Input

VSS

Ground

Serial Data Input

Serial Data Output

SCK

Serial Clock Input

MFP

Multifunction Pin

VCC

Primary Power Supply

Note 1: Exposed pad on TDFN can be connected to Vss or left floating.

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