DS1305 Maxim, DS1305 Datasheet

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DS1305

Manufacturer Part Number
DS1305
Description
The DS1305 serial alarm real-time clock provides a full binary coded decimal (BCD) clock calendar that is accessed by a simple serial interface
Manufacturer
Maxim
Datasheet

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0
19-5055; Rev 12/09
FEATURES
 Real-Time Clock (RTC) Counts Seconds,
 96-Byte, Battery-Backed NV RAM for Data
 Two Time-Of-Day Alarms, Programmable
 Supports Motorola SPI
 Burst Mode for Reading/Writing Successive
 Dual-Power Supply Pins for Primary and
 Optional Trickle Charge Output to Backup
 2.0V to 5.5V Operation
 Optional Industrial Temperature Range:
 Available in Space-Efficient, 20-Pin TSSOP
 Underwriters Laboratory (UL) Recognized
www.maxim-ic.com
SPI is a trademark of Motorola, Inc.
Minutes, Hours, Date of the Month, Month,
Day of the Week, and Year with Leap-Year
Compensation Valid Up to 2100
Storage
on Combination of Seconds, Minutes, Hours,
and Day of the Week
Interface) Modes 1 and 3 or Standard 3-Wire
Interface
Addresses in Clock/RAM
Backup Power Supplies
Supply
-C to +85C
Package
(Serial Peripheral
1 of 22
Serial Alarm Real-Time Clock
PIN CONFIGURATIONS
TYPICAL OPERATING CIRCUIT
TOP VIEW
V
V
X1
N.C.
X2
N.C.
INT0
N.C.
INT1
GND
V
V
X1
X2
N.C.
INT0
INT1
GND
CC2
BAT
CC2
BAT
DIP (300 mils)
TSSOP (4.4mm)
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
DS1305
DS1305
20
19
18
17
16
15
14
13
12
11
16
15
14
13
12
11
10
9
DS1305
V
N.C.
PF
V
SD0
SDI
SCLK
N.C.
CE
SERMODE
V
PF
V
SDO
SDI
SCLK
CE
SERMODE
CC1
CCIF
CC1
CCIF

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DS1305 Summary of contents

Page 1

... N. INT1 9 12 GND 10 11 TSSOP (4.4mm CC2 BAT DS1305 N. INT0 6 11 INT1 7 10 GND 8 9 DIP (300 mils) DS1305 V CC1 N. CCIF SD0 SDI SCLK N.C. CE SERMODE V CC1 PF V CCIF SDO SDI SCLK CE SERMODE ...

Page 2

... The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. In addition, 96 bytes of NV RAM are provided for data storage. The DS1305 will maintain the time and date, provided the oscillator is enabled, as long as at least one supply valid level. ...

Page 3

... Active-Low Interrupt 1 Output. The INT1 pin is an active-low output of the DS1305 that can be used as an interrupt input to a processor. The INT1 pin can be programmed to be asserted by Alarm 1 only. The INT1 pin remains low as long as the status bit causing the interrupt is present and the corresponding interrupt enable bit is set ...

Page 4

... Active-Low Power-Fail Output. The PF pin is used to indicate loss of the primary power supply (V ). When V CC1 the PF pin is driven low. Primary Power Supply. DC power is provided to the device on this pin. OSCILLATOR AND COUNTDOWN CHAIN FUNCTION pin allows the DS1305 to drive CCIF is less than less than V CC1 CC2 1Hz , BAT ...

Page 5

RECOMMENDED LAYOUT FOR CRYSTAL Local ground plane (Layer 2) crystal CLOCK ACCURACY The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and ...

Page 6

... Note: Range for alarm registers does not include mask’m’ bits. The DS1305 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit with logic high being PM ...

Page 7

... Oscillator) – This bit when set to logic 0 starts the oscillator. When this bit is set to a EOSC logic 1, the oscillator is stopped and the DS1305 is placed into a low-power standby mode with a current drain of less than 100nA when power is supplied by V will be set to a logic 1. ...

Page 8

... To prevent accidental enabling, only a pattern of 1010 enables the trickle charger. All other patterns disable the trickle charger. On the initial application of power, the DS1305 powers up with the trickle charger disabled. The diode select (DS) bits (bits 2–3) select whether one diode or two diodes are connected between V resistor that is connected between V bits, as shown in Table 3 ...

Page 9

... DS1305. The DS1305 does not write-protect itself in this configuration. CC2 CC2 Configuration 3 shows the DS1305 in battery operate mode where the device is powered only by a single battery. In this case, the V CC1 Only these three configurations are allowed. Unused supply pins must be grounded. ...

Page 10

Figure 4. POWER-SUPPLY CONFIGURATIONS NOTE: DEVICE IS WRITE-PROTECTED IF V NOTE: DEVICE DOES NOT PROVIDE AUTOMATIC WRITE PROTECTION. CONFIGURATION 1: BACKUP SUPPLY IS NONRECHARGEABLE LITHIUM BATTERY < CCTP CONFIGURATION 2: BACKUP SUPPLY IS A RECHARGEABLE BATTERY OR ...

Page 11

... SCLK (serial clock). The DS1305 is the slave device in an SPI application, with the microcontroller being the master. The SDI and SDO pins are the serial data input and output pins for the DS1305, respectively. The CE input is used to initiate and terminate a data transfer. The SCLK pin is used to synchronize data movement between the master (microcontroller) and the slave (DS1305) devices ...

Page 12

... Data transfers can occur one byte at a time or in multiple-byte burst mode. After CE is driven high an address is written to the DS1305. 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 CE is driven low. For a multiple-byte transfer, however, multiple bytes can be read or written to the DS1305 after the address has been written ...

Page 13

Figure 8. SPI MULTIPLE-BYTE BURST TRANSFER READING AND WRITING IN BURST MODE Burst mode is similar to a single-byte read or write, except that CE is kept high and additional SCLK cycles are sent until the end of the burst. ...

Page 14

INTERFACE The 3-wire interface mode operates similarly to the SPI mode. However, in 3-wire mode there is one I/O instead of separate data in and data out signals. The 3-wire interface consists of the I/O (SDI and SDO pins ...

Page 15

... Soldering Temperature………………………………………….See IPC/JEDEC J-STD-020 Specification This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time can affect reliability. ...

Page 16

DC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.) PARAMETER Input Leakage Output Leakage I = 1.5mA Logic 0 OL Output I = 4.0mA -0.4mA Logic 1 OH Output I = -1.0mA OH V Active Supply ...

Page 17

AC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.) (Figure 10 and Figure 11) PARAMETER Data to CLK Setup CLK to Data Hold CLK to Data Delay CLK Low Time CLK High Time CLK Frequency CLK Rise and ...

Page 18

Figure 10. TIMING DIAGRAM: 3-WIRE READ DATA TRANSFER SERMODE = GND * I/O IS SDI AND SDO TIED TOGETHER. Figure 11. TIMING DIAGRAM: 3-WIRE WRITE DATA TRANSFER SERMODE = GND * I/O IS SDI AND SDO TIED TOGETHER ...

Page 19

SPI AC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.) (Figure 12 and Figure 13) PARAMETER Data to CLK Setup CLK to Data Hold CLK to Data Delay CLK Low Time CLK High Time CLK Frequency CLK Rise and ...

Page 20

Figure 12. TIMING DIAGRAM: SPI READ DATA TRANSFER SERMODE = SCLK CAN BE EITHER POLARITY, TIMING SHOWN FOR CPOL = 1. Figure 13. TIMING DIAGRAM: SPI WRITE DATA TRANSFER SERMODE = SCLK CAN BE ...

Page 21

... V CCIF 12) Using a crystal on X1 and X2, rated for 6pF load. , SCLK=2MHz and bit = 0 (oscillator enabled). EOSC 0.8V and 10ms maximum rise and fall time 0.4V. OL > 0.2V (typical); V CC2 CC1 bit = 0 (oscillator enabled). ...

Page 22

... © 2009 Maxim Integrated Products DESCRIPTION ” to Figures 6, 7, 12, and 13 Maxim is a registered trademark of Maxim Integrated Products, Inc. DS1305 PAGES CHANGED 5 12 ...

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