DS1388 Просмотр технического описания (PDF) - Maxim Integrated
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DS1388 Datasheet PDF : 19 Pages
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I2C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
Pin Description
PIN
NAME
FUNCTION
1
X1
Connections for a Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for
operation with a crystal having a specified load capacitance (CL) of 6.0pF. Pin X1 is the input to the
2
X1
oscillator and can optionally be connected to an external 32.768kHz oscillator. The output of the internal
oscillator, pin X2, is floated if an external oscillator is connected to pin X1.
Connection for a Secondary Power Supply. Supply voltage must be held between 1.3V and 5.5V for proper
operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally, this pin
3
VBACKUP can be connected to a rechargeable cell or a super cap when used with the trickle-charge feature. If not
used, this pin must be connected to ground. UL recognized to ensure against reverse charging current
when used with a lithium battery (www.maxim-ic.com/qa/info/ul/).
4
GND Ground
5
SDA
Serial Data Output. SDA is the input/output for the I2C serial interface. This pin is open drain and requires
an external pullup resistor. The pullup voltage can be up to 5.5V, regardless of the voltage on VCC.
6
SCL
Serial Clock Input. SCL is the clock input for the I2C interface and is used to synchronize data movement
on the serial interface. Up to 5.5V can be used for this pin, regardless of the voltage on VCC.
Active-Low, Open-Drain Reset Output. This pin indicates the status of VCC relative to the VPF
specification. As VCC falls below VPF, the RST pin is driven low. When VCC exceeds VPF, for tRST, the RST
7
RST
pin is driven high impedance. The active-low, open-drain output is combined with a debounced
pushbutton input function. This pin can be activated by a pushbutton reset request. It has an internal
50k nominal value pullup resistor to VCC. No external pullup resistors should be connected. If the
crystal oscillator is disabled, the startup time of the oscillator is added to the tRST delay.
8
VCC DC Power Pin for Primary Power Supply
Block Diagram
X1
X2
VCC
GND
VBACKUP
RST
CL
CL
POWER CONTROL
AND
TRICKLE CHARGER
BLOCK 0
CLOCK AND CALENDAR
REGISTERS
WATCHDOG
TIMER
STATUS CONTROL/
TRICKLE
BLOCK 1
EEPROM
BLOCK 2
EEPROM
SDA
I2C
INTERFACE
SCL
EEPROM
INTERFACE
DS1388
8 _____________________________________________________________________
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