PDF S-3511A Data sheet ( Hoja de datos )

Número de pieza	S-3511A
Descripción	REAL-TIME CLOCK
Fabricantes	Seiko
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No Preview Available ! Rev.1.2 REAL-TIME CLOCK S-3511A S-3511A is a CMOS real-time clock IC, which is designed to transfer or set each data of a clock and calender as requested by a CPU. It provides connection with a CPU via three wires and has an interrupt/alarm feature, allowing the alleviation of software treatment on the side of a host. It also works on lower power with the oscillating circuit operated at a constant voltage. The shipping form is either a die or an 8-pin SSOP ultra compact package. ! Features ! • Low power consumption : 0.7 µA typ. (VDD=3.0 V) • Wide area of operating voltage : 1.7 to 5.5 V • BCD input/output of year, month, day, day of a week, hour, minute and second • CPU interface via three wires • • Auto calender till the year of 2,099 (automatic leap year arithmetic feature included) • Built-in power voltage detecting circuit • Built-in constant voltage circuit • Built-in flag generating circuit on power on/off • Built-in alarm interrupter • Steady-state interrupt frequency/duty setting feature • Built-in 32 kHz crystal oscillating circuit (Internal Cd, External Cg) • Die or 8-pin SSOP package (pin pitch: 0.65 mm) Applications • Cellular phone • PHS • A variety of pagers • TV set and VCR Camera ! Block Diagram XIN XOUT Oscillating circuit Timing generatio n INT Register Comparator Clock generating circuit INT Status register Second Minute Hour Day of week Day Month Year VDD VSS Power voltage detecting circuit Constant voltage circuit Shift register Serial Interface SIO CS SCK Figure 1 Block diagram Seiko Instruments Inc. 1 1 page REAL-TIME CLOCK S-3511A 1-2. Data writing When you input data from the SIO pin in synchronization with the falling of the SCK pin after turning the CS pin to "H", the data is included into the inside of S-3511A at the eighth rising of the SCK clock and the state of data writing is reached when the R/W bit has "0." In the state, the data is written to registers according each command in synchronization with the falling of subsequent SCK clock input. (1) Real-time data writing 1 CS SCK 1 9 SIO X 0 1 1 0 0 1 0 0 MSB LSB LSB MSB Command Year data (2) Real-time data writing 2 CS SCK 1 9 SIO X 01100110 MSB LSB LSB MSB Command Hour data 64 TEST LSB MSB Second data 32 TEST LSB MSB Second data (3) Status register writing CS SCK 1 9 SIO X 0 1 1 0 0 0 1 0 POWER MSB LSB LSB MSB Command Status data Figure 4 Write communication Seiko Instruments Inc. 5 5 Page REAL-TIME CLOCK S-3511A 3-3. When the reset command is received When the reset command is received, each register turns as follows: Real-time data register : 00 (year), 01 (month), 01 (day), 0 (day of week), 00 (hour), 00 (minute), 00 (second) Status register : "00h" INT register : "0000h" VDD POWER flag SIO LINE command data 0 1 1 00 0 1 1 0 1 0 0 00 0 1 M LR L M S S/ S S B BW B POWER flag B status read command status data command 0 1 1 00 0 0 1 M S B Don't care LR S/ BW reset command VDD POWER flag SIO LINE backup state (S-3511A does not reach any indefinite area) CPU down command data 0 1 1 00 0 1 1 00 0 0 00 0 0 M LR L M S S/ S S B B W B POWER flag B status read command status data Figure 11 Initializing command 0 1 1 00 1 0 1 M LR S S/ B BW real-time data read command Seiko Instruments Inc. 11 11 Page

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