DS1340-3 MAXIM [Maxim Integrated Products], DS1340-3 Datasheet

Page 1

... SO 1340C-3 -40°C to +85° 1340C-33 -40°C to +85° (0.150in) D1340-18 -40°C to +85° (0.150in) DS1340-3 -40°C to +85° (0.150in) D1340-33 1340A1-18 -40°C to +85°C 8 µSOP 1340A1-3 1340A1-33 -40°C to +85° 1340C-18 -40° ...

Page 2

I C RTC with Trickle Charger ABSOLUTE MAXIMUM RATINGS Voltage Range on V Pin Relative to Ground .....-0.3V to +6.0V CC Voltage Range on SDA, SCL, and FT/OUT Relative to Ground..................................-0. Operating Temperature Range ...........................-40°C to +85°C ...

Page 3

... > 1.7V < V < OLSQW CC OL 1.3V < V < 1.7V 0. DS1340-18 I DS1340-3 CCA DS1340-33 DS1340-18 I DS1340-3 CCS DS1340- 3.7V BACKUP CONDITIONS OSC ON (Note 15) OSC ON (Note 15) OSC ON 3.0V, BACKUP T = +25°C (Notes 15, 16) A OSC OFF _____________________________________________________________________ = 3.3V +25° ...

Page 4

I C RTC with Trickle Charger POWER-UP/POWER-DOWN CHARACTERISTICS (T = -40°C to +85°C) (Figure 2) A PARAMETER SYMBOL Recovery at Power- Fall Time PF(MAX) t VCCF V PF(MIN) V Rise Time ...

Page 5

PF(MAX) V PF(MIN) RST RECOGNIZED INPUTS OUTPUTS VALID Figure 2. Power-Up/Power-Down Timing (V = +3.3V +25°C, unless otherwise noted vs CCSA CC 250 200 150 100 50 0 ...

Page 6

... H ow ever , the ti m ekeep i ng functi on conti nues unaffected b y the vol tag e. — 4–13 N.C. No Connection. Must be connected to ground. Detailed Description The DS1340 is a low-power clock/calendar with a trickle charger. Address and data are transferred serially 2 through bidirectional bus. The clock/calendar pro- vides seconds, minutes, hours, day, date, month, and year information ...

Page 7

... Figure 3. Oscillator Circuit Showing Internal Bias Network RTC with Trickle Charger The DS1340 operates as a slave device on the serial bus. Access is obtained by implementing a START condition and providing a device identification code fol- lowed by data. Subsequent registers can be accessed sequentially until a STOP condition is executed. The ...

Page 8

... I C RTC with Trickle Charger Address Map Table 3 shows the DS1340 address map. The RTC reg- isters are located in address locations 00h to 06h, and the control register is located at 07h. The trickle-charge and flag registers are located in address locations 08h to 09h. During a multibyte access of the timekeeping registers, when the address pointer reaches 07h— ...

Page 9

Control Register (07h) Bit 7: Output Control (OUT). This bit controls the out- put level of the FT/OUT pin when the FT bit is set the logic level on the FT/OUT pin is 1 ...

Page 10

... Bits All other bits in the flag register read as 0 and cannot be written. Clock Calibration The DS1340 provides a digital clock calibration feature to allow compensation for crystal and temperature vari- ations. The calibration circuit adds or subtracts counts from the oscillator divider chain at the divide-by-256 stage ...

Page 11

... A master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP condi- tions must control the bus. The DS1340 operates slave on the I C bus. Connections to the bus are made through the open-drain I/O lines SDA and SCL ...

Page 12

... START condition. Since a repeated START condition is also the beginning of the next serial transfer, the bus is not released. The DS1340 can operate in the following two modes: Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCL. ...

Page 13

... Handling, PC Board Layout, and Assembly The DS1340C package contains a quartz tuning-fork crystal. Pick-and-place equipment may be used, but precautions should be taken to ensure that excessive shocks are avoided. Exposure to reflow is limited to 2 times maximum. Ultrasonic cleaning should be avoided to prevent damage to the crystal. Avoid running signal traces under the package, unless a ground plane is placed between the package and the signal line ...

Page 14

I C RTC with Trickle Charger Chip Information TRANSISTOR COUNT: 10,930 PROCESS: CMOS SUBSTRATE CONNECTED TO GROUND Thermal Information Theta-JA: +170°C/W (0.150in SO) Theta-JC: +40°C/W (0.150in SO) Theta-JA: +221°C/W (µSOP) Theta-JC: +39°C/W (µSOP) Theta-JA: +89.6°C/W (0.300in SO) Theta-JC: +24.8°C/W ...