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DS1302 Datenblatt(PDF) 4 Page - Maxim Integrated Products |
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DS1302 Datenblatt(HTML) 4 Page - Maxim Integrated Products |
4 / 13 page DS1302 Trickle-Charge Timekeeping Chip 4 of 13 PIN DESCRIPTION PIN NAME FUNCTION 1 VCC2 Primary Power-Supply Pin in Dual Supply Configuration. VCC1 is connected to a backup source to maintain the time and date in the absence of primary power. The DS1302 operates from the larger of VCC1 or VCC2. When VCC2 is greater than VCC1 + 0.2V, VCC2 powers the DS1302. When VCC2 is less than VCC1, VCC1 powers the DS1302. 2 X1 3 X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator is designed for operation with a crystal having a specified load capacitance of 6pF. For more information on crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations for Dallas Real-Time Clocks . The DS1302 can also be driven by an external 32.768kHz oscillator. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated. 4 GND Ground 5 CE Input. CE signal must be asserted high during a read or a write. This pin has an internal 40k Ω (typ) pulldown resistor to ground. Note: Previous data sheet revisions referred to CE as RST. The functionality of the pin has not changed. 6 I/O Input/Push-Pull Output. The I/O pin is the bidirectional data pin for the 3-wire interface. This pin has an internal 40k Ω (typ) pulldown resistor to ground. 7 SCLK Input. SCLK is used to synchronize data movement on the serial interface. This pin has an internal 40k Ω (typ) pulldown resistor to ground. 8 VCC1 Low-Power Operation in Single Supply and Battery-Operated Systems and Low- Power Battery Backup. In systems using the trickle charger, the rechargeable energy source is connected to this pin. UL recognized to ensure against reverse charging current when used with a lithium battery. Go to www.maxim- ic.com/TechSupport/QA/ntrl.htm . |
Ähnliche Teilenummer - DS1302 |
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Ähnliche Beschreibung - DS1302 |
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