DS3232S datasheet(18/19 Pages) MAXIM

18 / 19 page

The DS3232 can operate in the following two modes:

Slave receiver mode (DS3232 write mode): Serial

data and clock are received through SDA and SCL.

After each byte is received, an acknowledge bit is

transmitted. START and STOP conditions are recog-

nized as the beginning and end of a serial transfer.

Address recognition is performed by hardware after

reception of the slave address and direction bit. The

slave address byte is the first byte received after the

master generates the START condition. The slave

address byte contains the 7-bit DS3232 address,

which is 1101000, followed by the direction bit (R/W),

which is 0 for a write. After receiving and decoding

the slave address byte, the DS3232 outputs an

acknowledge on SDA. After the DS3232 acknowl-

edges the slave address + write bit, the master

transmits a word address to the DS3232. This sets

the register pointer on the DS3232, with the DS3232

acknowledging the transfer. The master may then

transmit zero or more bytes of data, with the DS3232

acknowledging each byte received. The register

pointer increments after each data byte is trans-

ferred. The master generates a STOP condition to

terminate the data write.

Slave transmitter mode (DS3232 read mode): The

first byte is received and handled as in the slave

receiver mode. However, in this mode, the direction

bit indicates that the transfer direction is reversed.

Serial data is transmitted on SDA by the DS3232

while the serial clock is input on SCL. START and

STOP conditions are recognized as the beginning

and end of a serial transfer. Address recognition is

performed by hardware after reception of the slave

address and direction bit. The slave address byte is

the first byte received after the master generates a

START condition. The slave address byte contains

the 7-bit DS3232 address, which is 1101000, fol-

lowed by the direction bit (R/W), which is 1 for a

read. After receiving and decoding the slave

address byte, the DS3232 outputs an acknowledge

on SDA. The DS3232 then begins to transmit data

starting with the register address pointed to by the

before the initiation of a read mode, the first address

that is read is the last one stored in the register point-

er. The DS3232 must receive a not acknowledge to

end a read.

Handling, PC Board Layout,

and Assembly

The DS3232 package contains a quartz tuning-fork

crystal. Pick-and-place equipment can be used, but

precautions should be taken to ensure that excessive

shocks are avoided. Exposure to reflow is limited to 2

times maximum. Ultrasonic cleaning should be avoided

to prevent damage to the crystal.

Avoid running signal traces under the package, unless

a ground plane is placed between the package and the

signal line. All N.C. (no connect) pins must be connect-

ed to ground.

Chip Information

SUBSTRATE CONNECTED TO GROUND

PROCESS: CMOS

Package Information

For the latest package outline information and land patterns,

go to www.maxim-ic.com/packages. Note that a “+”, “#”, or

“-” in the package code indicates RoHS status only. Package

drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

Extremely Accurate I2C RTC with

Integrated Crystal and SRAM

____________________________________________________________________

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

20 SO

W20#H2

21-0042

90-0108

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