MQ252-03 Application Manual Real Time Clock Module RTC-4543SA/SB Model Product Number RTC-4543SA Q4145435x000200 RTC-4543SB Q4145436x000200
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RTC - 4543 SA/SB CONTENTS 1. OVERVIEW ........................................................................................................1 2. BLOCK DIAGRAM ...........................................................................................1 3. PIN CONNECTIONS.......................................................................................2 4. PIN FUNCTIONS..............................................................................................2 5. ELECTRICAL CHARACTERISTICS .........
RTC - 4543 SA/SB 32-kHz Output Serial RTC Module RTC - 4543 SA/SB z Built-in crystal permits operation without requiring adjustment z Built-in time counters (seconds, minutes, hours) and calendar counters (days, days of the week months, years) z Operating voltage range: 2.5 V to 5.5 V z Supply voltage detection voltage: 1.7 ±0.3 V z Low current consumption: 1.0 µA/2.0 V (Max.) z Automatic processing for leap years z Output selectable between 32.768 kHz/1 Hz 1.
RTC - 4543 SA/SB 3. Pin Connections RTC - 4543SA 1 GND 2 N.C RTC - 4543SB 14 FOUT 1 3 CE 12 N.C 4 FSEL 11 DATA 5 WR 10 CLK 6 FOE 7 1 2 3 4 5 6 7 8 9 13 N.C 14 9 V DD 8 8 N.C 7 N.C SOP - 14pin N.C N.C N.C N.C FOE WR FSEL CE GND 1 18 9 10 18 N.C 17 N.C 16 N.C 15 N.C 14 V DD 13 N.C 12 CLK 11 DATA 10 FOUT SOP - 18pin 4. Pin Functions Pin No. Signal GND SOP-14pin (SOP-18pin) I/O 1 (9) Connects to negative (-) side (ground) of the power supply.
RTC - 4543 SA/SB 5. Electrical Characteristics 5-1. Absolute Maximum Ratings Item Supply voltage Input voltage Output voltage Storage temperature Symbol VDD VI VO TSTG Conditions - Min. -0.3 GND-0.3 GND-0.3 -55 Max. 7.0 VDD+0.3 VDD+0.3 +125 Unit V V V °C Ta=+25 °C Symbol Conditions Min. Max. Unit VDD - 2.5 5.5 V VCLK TOPR - 1.4 -40 5.5 +85 V °C Max. Unit 5 ± 23 * ×10 5-2.
RTC - 4543 SA/SB 5-5. AC Characteristics Unless specified otherwise: Ta = - 40 to +85 °C, CL = 50 pF Unit Symbol VDD=3 V ± 10 % VDD=5 V ± 10 % Item Min. Max. Min. Max. CLK clock cycle CLK low pulse width tCLK tCLKL 0.75 0.375 7800 3900 1.5 0.75 7800 3900 µs µs CLK high pulse width tCLKH 0.375 3900 0.75 3900 µs CLK setup time tCLKS 25 CE setup time tCES 0.375 CE hold time tCEH 0.375 CE enable time tCE Write data setup time tSD 0.1 0.2 µs Write data hold time tHD 0.1 0.
RTC - 4543 SA/SB 5-6.
RTC - 4543 SA/SB 6. Timer Data Organization • The counter data is BCD code. • The timer automatically adjusts for different month lengths and for leap year. • The time is indicated in 24-hour format. • Writes and reads are both performed on an LSB-first basis.
RTC - 4543 SA/SB 7. Description of Operation 7-1.Data reads 1 2 52 53 54 54+n CLK CE WR DATA s1 s2 s4 s8 s10 s20 s40 FDT y8 y10 y20 y40 y80 Year Sec Output data does not change 1) 2) 3) 4) 5) 6) 7) When the WR pin is low and the CE pin is high, the RTC enters data output mode. At the first rising edge of the CLK signal, the clock and calendar data are loaded into the shift register and the LSB of the seconds digits is output from the DATA pin.
RTC - 4543 SA/SB 7-3. Data writes (Divider Reset) CE WR 1 2 52 CLK N Seconds DATA s1 s2 s4 s8 s10 s20 s40 Timer,counter N seconds y8 y10 y20 y40 y80 0 seconds N seconds Divider reset Pulse Carry stop Pulse After the counter is reset, carries to the seconds digit are halted.After the data write operation, the prohibition on carries to the seconds counter is lifted by setting the CE pin low. Complete data write operations within tCE (Max.) = 0.9 seconds, as described earlier. 7-4.
RTC - 4543 SA/SB 8. Examples of External Circuits • Example 1. When used as an RTC + clock source VDD Power supply Switching circuit VDD RTC 4543 Power supply Detection circuit VDD CE WR DATA 0.1 µF CLK FOUT *1 FSEL *2 FOE GND *1: FOUT output frequency setting (High: 1 Hz; low: 32.768 kHz) *2: Prohibits FOUT output during back up, reducing current consumption. • Example 2. When used as a clock source (oscillator) VDD RTC-4543 VDD CE VDD VDD WR DATA 0.
RTC - 4543 SA/SB 9. External Dimensions RTC - 4543 SA ( SOP-14pin ) 10.1 ± 0.2 0.35 ∗ 1.27 5.0 7.4 ± 0.2 0.05 Min. 3.2 ± 0.1 0.15 0 - 10° 1.2 0.6 The cylinder of the crystal oscillator can be seen in this area ( front ), but it has no affect on the performance of the device. RTC - 4543 SB ( SOP-18pin ) 11.4 ± 0.2 5.4 7.8 ± 0.2 0.15 1.8 2.0 Max. 0.4 1.27 0 Min. 0 - 10 0.12 0.6 ± 0.2 0.1 10.
RTC - 4543 SA/SB 11. Reference Data (1) Example of Frequency-Temperature Characteristics θT = +25 °C Typ. Determining the frequency stability (clock accuracy) Frequency ∆ fT α = -0.035 × 10-6/ °C 2 Typ. 1.The frequency-temperature characteristics can be × 10-6 +10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 approximated by the following equation: ∆fT = α(θT-θX)2 ∆fT α( /°C2) θT(°C) θX(°C) : Frequency deviation at any given temperature : Second-order temperature ((-0.035±0.
RTC - 4543 SA/SB 12. Application notes 12-1. Notes on handling This module uses a C-MOS IC to realize low power consumption. Carefully note the following cautions when handling. (1) Static electricity While this module has built-in circuitry designed to protect it against electrostatic discharge, the chip could still be damaged by a large discharge of static electricity. Containers used for packing and transport should be constructed of conductive materials.
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