DS1390-DS1393 MAXIM [Maxim Integrated Products], DS1390-DS1393 Datasheet
DS1390-DS1393
Related parts for DS1390-DS1393
DS1390-DS1393 Summary of contents
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... V and automatically switches to the CC backup supply if a power failure is detected. On the DS1390, a single open-drain output provides a CPU interrupt or a square wave at one of four selectable fre- quencies. The DS1391 replaces the SQW/INT pin with a RST output/debounced input. The DS1390 and DS1391 are programmed serially through an SPI-compatible, bidirectional bus ...
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... Resistors Input Leakage I/O Leakage I RST Pin I/O Leakage I LORST DOUT Logic 1 Output I OHDOUT DOUT Logic 0 Output I OHDOUT Logic 0 Output (DS1390/DS1393 SQW/INT; I OLSIR DS1392 SQW, INT; DS1391/DS1393 RST) V Active Supply Current CC I CCA (Note 10) 2 _____________________________________________________________________ Storage Temperature Range .............................-55°C to +125°C Soldering Temperature .......................................See IPC/JEDEC + 0 ...
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Low-Voltage SPI/3-Wire RTCs with RECOMMENDED DC OPERATING CONDITIONS (continued -40°C to +85°C, unless otherwise noted. Typical values are at nominal supply voltage and T CC CC(MIN) CC(MAX) A unless otherwise noted.) (Note ...
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Low-Voltage SPI/3-Wire RTCs with Trickle Charger SCLK t CDH t DC DIN W/R DOUT NOTE: SCLK CAN BE EITHER POLARITY, SHOWN FOR CPOL = 1. Figure 1. Timing Diagram—SPI Read Transfer SCLK R ...
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Low-Voltage SPI/3-Wire RTCs with AC ELECTRICAL CHARACTERISTICS—3-WIRE INTERFACE ( -40°C to +85°C.) (Note 1) (Figures CC(MIN) CC(MAX) A PARAMETER SYMBOL SCLK Frequency (Note 13) Data to SCLK Setup SCLK to ...
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Low-Voltage SPI/3-Wire RTCs with Trickle Charger SCLK CDH t DC I/O A0 WRITE ADDRESS BYTE Figure 3. Timing Diagram—3-Wire Read Transfer SCLK CDH t DC I/O ...
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Low-Voltage SPI/3-Wire RTCs with POWER-UP/POWER-DOWN CHARACTERISTICS (T = -40°C to +85°C) (Figures PARAMETER SYMBOL V Detect to Recognize Inputs CC (V Rising Fall Time PF(MAX) V PF(MIN) V Rise Time ...
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... CC BACKUP Note 6: Measured typ BACKUP SCLK, DIN DS1390/DS1391; SCLK, and CE on DS1392/DS1393. Note 7: DOUT, SQW/INT (DS1390/DS1393), SQW, and INT (DS1392). Note 8: The RST pin has an internal 50k (typ) pullup resistor to V Note 9: Note 10: I —SCLK clocking at max frequency = 4MHz for 3V and 3.3V versions; 1MHz for 1.8V version; RST (DS1391/DS1393) CCA inactive ...
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Low-Voltage SPI/3-Wire RTCs with (V = +3.3V +25°C, unless otherwise noted vs. V BACKUP 600 550 500 450 400 350 300 1.3 1.7 2.1 2.5 2.9 V BACKUP I vs. TEMPERATURE BACKUP V BACKUP 600 ...
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... Low-Voltage SPI/3-Wire RTCs with Trickle Charger PIN DS1390 DS1391 DS1392 DS1393 — — — — — — — — 6 — — 9 — — — — — ...
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... The DS1390/DS1391/DS1392/DS1393 RTCs are low- power clocks/calendars with alarms. Address and data are transferred serially through a 4-wire SPI interface for the DS1390 and DS1391 and through a 3-wire inter- face for the DS1392 and DS1393. The clocks/calendars provide hundredths of seconds, seconds, minutes, hours, day, date, month, and year information ...
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Low-Voltage SPI/3-Wire RTCs with Trickle Charger However, when V falls below registers are blocked from any access than V , the device power is switched from V BACKUP to V when V drops below V ...
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... Low-Voltage SPI/3-Wire RTCs with Table 2 shows the address map for the DS1390– DS1393 RTC and RAM registers. The RTC registers are located in address locations 00h to 0Fh in read mode, and 80h to 8Fh in write mode. During a multibyte access, when the address pointer reaches 0Fh, it wraps around to location 00h ...
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... Sunday, then 2 equals Monday, and so on). Illogical time and date entries result in undefined operation. The DS1390–DS1393 can run in either 12-hour or 24-hour mode. Bit 6 of the hours Table 3. Alarm Mask Bits ...
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Low-Voltage SPI/3-Wire RTCs with The DY/DT bits (bit 6 of the alarm day/date registers) control whether the alarm value stored in bits that register reflects the day of the week or the date of the month. ...
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... BIT 7 BIT 6 BIT 5 EOSC 0 Control bits used in the DS1390 become general-pur- pose, battery-backed, nonvolatile SRAM bits in the DS1391. 16 ____________________________________________________________________ Control Register (0D/8Dh) (DS1390/DS1393 Only) BIT 4 BIT 3 RS2 RS1 Bit 2: Interrupt Control (INTCN). This bit controls the SQW/INT signal. When the INTCN bit is set to logic 0, a square wave is output on the SQW/INT pin ...
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... Low-Voltage SPI/3-Wire RTCs with BIT 7 BIT 6 EOSC 0 BBSQI The INTCN bit used in the DS1390/DS1393 becomes the SQW pin-enable bit in the DS1392. This bit powers up a zero, making SQW active. BIT 7 BIT 6 OSF 0 Bit 7: Oscillator Stop Flag (OSF). A logic 1 in this bit ...
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... TRICKLE-CHARGE REGISTER (8Fh WRITE, 0Fh READ) BIT 6 BIT 5 BIT 4 BIT 7 TCS3 TCS2 TCS1 TCS0 SELECT NOTE: ONLY 1010b ENABLES CHARGER V CC Figure 9. DS1390/DS1391 Programmable Trickle Charger Table 6. SPI Pin Function MODE CSZ SCLK SDI Input Input Disable H Disabled Disabled CPOL ...
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... Data transfers can occur one byte at a time or in multi- ple-byte burst mode. After CS is driven low, an address is written to the DS1390/DS1391. After the address, one or more data bytes can be written or read. For a single- byte transfer, one byte is read or written and then CS is driven high ...
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Low-Voltage SPI/3-Wire RTCs with Trickle Charger CS SCLK DIN WRITE ADDRESS BYTE DIN ADDRESS BYTE READ DOUT HIGH-IMPEDANCE Figure 13. SPI Multiple-Byte Burst Transfer CE SCLK I Figure 14. 3-Wire Single-Byte Read CE SCLK I/O A0 ...
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Low-Voltage SPI/3-Wire RTCs with 3-Wire Serial-Data Bus The DS1392/DS1393 provide a 3-wire serial-data bus, and support both single-byte and multiple-byte data transfers for maximum flexibility. The I/O pin is the seri- al-data input/output pin. The CE input is used to ...
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... Low-Voltage SPI/3-Wire RTCs with Trickle Charger TOP VIEW DS1390 V 3 BACKUP GND SOP DS1392 V 3 BACKUP GND SOP 22 ____________________________________________________________________ SQW/INT SCLK BACKUP 7 4 DOUT DIN GND ...
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... Low-Voltage SPI/3-Wire RTCs with CRYSTAL SQW/INT SCLK CPU DS1390 DOUT V BACKUP DIN GND CRYSTAL SQW SCLK CPU DS1392 I/O INT V BACKUP GND ____________________________________________________________________ Trickle Charger Typical Operating Circuits CRYSTAL ...
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Low-Voltage SPI/3-Wire RTCs with Trickle Charger (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/DallasPackInfo 0.50±0.1 0.6±0.1 1 0.6±0.1 TOP ...