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DS1390_07 Datasheet

Download or read online Maxim Integrated DS1390_07 Low-Voltage SPI/3-Wire RTCs with Trickle Charger pdf datasheet.



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Rev 1; 1/07
Low-Voltage SPI/3-Wire RTCs with
General Description
The low-voltage serial-peripheral interface (SPI™)
DS1390/DS1391 and the low-voltage 3-wire DS1392/
DS1393 real-time clocks (RTCs) are clocks/calendars
that provide hundredths of a second, seconds, min-
utes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in either
the 24-hour or 12-hour format with an AM/PM indicator.
One programmable time-of-day alarm is provided. A
temperature-compensated voltage reference monitors
the status of V
and automatically disables the bus
CC
interface and switches to the 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 frequencies. 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. The
DS1392 and DS1393 communicate over a 3-wire serial
bus, and the extra pin is used for either a separate
interrupt pin or a RST output/debounced input.
All four devices are available in a 10-pin µSOP package,
and are rated over the industrial temperature range.
Applications
Hand-Held Devices
GPS/Telematics Devices
Embedded Time Stamping
Medical Devices
Typical Operating Circuits and Pin Configurations appear at
end of the data sheet.
SPI is a trademark of Motorola, Inc.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
♦ Real-Time Clock Counts Hundredths of Seconds,
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap-Year Compensation Valid Up to
2100
♦ Output Pin Configurable as Interrupt or Square
Wave with Programmable Frequency of
32.768kHz, 8.192kHz, 4.096kHz, or 1Hz
(DS1390/DS1393 Only)
♦ One Time-of-Day Alarm
♦ Power-Fail Detect and Switch Circuitry
♦ Reset Output/Debounced Input (DS1391/DS1393)
♦ Separate SQW and INT Output (DS1392)
♦ Trickle-Charge Capability
♦ SPI Supports Modes 1 and 3 (DS1390/DS1391)
♦ 3-Wire Interface (DS1392/DS1393)
♦ 4MHz at 3.0V and 3.3V
♦ 1MHz at 1.8V
♦ Three Operating Voltages: 1.8V ±5%, 3.0V ±10%,
and 2.97 to 5.5V
♦ Industrial Temperature Range: -40°C to +85°C
♦ Underwriters Laboratory (UL) Recognized
PART
DS1390U-18+
DS1390U-3+
DS1390U-33+
DS1391U-18+
DS1391U-3+
DS1391U-33+
DS1392U-18+
DS1392U-3+
DS1392U-33+
DS1393U-18+
DS1393U-3+
DS1393U-33+
Note: All devices are rated for the -40°C to +85°C operating
temperature range.
+ Denotes lead-free package.
† A “+” anywhere on the top mark denotes a lead-free/RoHS-
compliant package.
rr = Revision code on second line of top mark.
______________________________________________ Maxim Integrated Products
Trickle Charger
Features
Ordering Information
TYP
PIN-
TOP MARK †
OPERATING
PACKAGE
VOLTAGE (V)
1.8
10 μSOP
1390 rr-18
3.0
10 μSOP
1390 rr-3
3.3
10 μSOP
1390 rr-33
1.8
10 μSOP
1391 rr-18
3.0
10 μSOP
1391 rr-3
3.3
10 μSOP
1391 rr-33
1.8
10 μSOP
1393 rr-18
3.0
10 μSOP
1392 rr-3
3.3
10 μSOP
1392 rr-33
1.8
10 μSOP
1393 rr-18
3.0
10 μSOP
1393 rr-3
3.3
10 μSOP
1393 rr-33
1

Summary of Contents

Page 1

... Note: All devices are rated for the -40°C to 85°C operating temperature range. Denotes lead-free package. A anywhere on the top mark denotes a lead-free/RoHS- compliant package Revision code on second line of top mark. ___ Maxim Integrated Products Trickle Charger Features Ordering Information TYP PIN- TOP MARK † ...

Page 2

Low-Voltage SPI/3-Wire RTCs with Trickle Charger ABSOLUTE MAXIMUM RATINGS Voltage Range on V Pin Relative to Ground ...-0.3V to 6.0V CC Voltage Range on Inputs Relative to Ground ...-0. Operating Temperature Range ...- 85 C Stresses ...

Page 3

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 ...

Page 4

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 DiagramSPI Read Transfer SCLK t CDH ...

Page 5

Low-Voltage SPI/3-Wire RTCs with AC ELECTRICAL CHARACTERISTICS3-WIRE INTERFACE ( -40°C to 85°C.) (Note 1) (Figures CC(MIN) CC(MAX) A PARAMETER SYMBOL SCLK Frequency (Note 13) f Data to SCLK Setup SCLK ...

Page 6

Low-Voltage SPI/3-Wire RTCs with Trickle Charger SCLK CDH t DC I/O A0 WRITE ADDRESS BYTE Figure 3. Timing Diagram3-Wire Read Transfer SCLK CDH t DC I/O ...

Page 7

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 ...

Page 8

Low-Voltage SPI/3-Wire RTCs with Trickle Charger CAPACITANCE (T 25°C) A PARAMETER SYMBOL Capacitance on All Input Pins Capacitance on All Output Pins (High Impedance) WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when the device is ...

Page 9

Low-Voltage SPI/3-Wire RTCs with (V 3.3V 25°C, unless otherwise noted vs. V BACKUP BACKUP 600 550 500 450 400 350 300 1.3 1.7 2.1 2.5 2.9 3.3 3.7 V BACKUP I vs. TEMPERATURE BACKUP ...

Page 10

Low-Voltage SPI/3-Wire RTCs with Trickle Charger PIN DS1390 DS1391 DS1392 DS1393 — ...

Page 11

Low-Voltage SPI/3-Wire RTCs with X1 32,768Hz CRYSTAL OSCILLATOR LEVEL DETECT, CC POWER SWITCH, GND WRITE PROTECT, TRICKLE CHARGER V BACKUP (DS1390/91) CS (DS1392/93) (CE) SCLK BUS (DS1390/91) DIN INTERFACE (DS1390/91) DOUT (DS1392/93) I/O Detailed Description The ...

Page 12

Low-Voltage SPI/3-Wire RTCs with Trickle Charger Power Control The power-control function is provided by a precise, temperature-compensated voltage reference and a comparator circuit that monitors the V device is fully accessible and data can be written and read when V ...

Page 13

Low-Voltage SPI/3-Wire RTCs with Address Map Table 3 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 ...

Page 14

Low-Voltage SPI/3-Wire RTCs with Trickle Charger Hundredths-of-Seconds The hundredths-of-seconds generator circuit shown in the functional diagram is a state machine that divides the incoming frequency (4096Hz for 24 cycles and 40 for one cycle. This produces a 100Hz ...

Page 15

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. ...

Page 16

Low-Voltage SPI/3-Wire RTCs with Trickle Charger Special-Purpose Registers The DS1390DS1393 have three additional registers (control, status, and trickle charger) that control the RTC, alarms, square-wave output, and trickle charger. BIT 7 BIT 6 BIT 5 EOSC 0 BBSQI Bit 7: ...

Page 17

Low-Voltage SPI/3-Wire RTCs with BIT 7 BIT 6 BIT 5 EOSC 0 BBSQI The INTCN bit used in the DS1390/DS1393 becomes the SQW pin-enable bit in the DS1392. This bit powers BIT 7 BIT 6 BIT 5 OSF 0 Bit ...

Page 18

Low-Voltage SPI/3-Wire RTCs with Trickle Charger 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 ...

Page 19

Low-Voltage SPI/3-Wire RTCs with CS SCLK DIN W DOUT HIGH IMPEDANCE Figure 11. SPI Single-Byte Write CS SCLK DIN W DOUT HIGH IMPEDANCE Figure 12. SPI Single-Byte Read SPI Serial-Data Bus The DS1390/DS1391 provide a ...

Page 20

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 ...

Page 21

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 ___ ...

Page 23

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 ...

Page 24

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 Ø 0.50±0.1 0.6±0.1 1 0.6±0.1 TOP VIEW D2 A2 ...

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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ___ 25 © 2007 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation ...

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