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X1205 Schematic ( PDF Datasheet ) - Xicor

Teilenummer X1205
Beschreibung Real Time Clock/Calendar
Hersteller Xicor
Logo Xicor Logo 




Gesamt 22 Seiten
X1205 Datasheet, Funktion
Preliminary Information
New Features
Repetitive Alarms &
Temperature Compensation
X1205
Real Time Clock/Calendar
2-WireRTC
FEATURES
• Real Time Clock/Calendar
—Tracks time in Hours, Minutes, and Seconds
—Day of the Week, Day, Month, and Year
• 2 Polled Alarms (Non-volatile)
—Settable on the Second, Minute, Hour, Day of
the Week, Day, or Month
—Repeat Mode (periodic interrupts)
• Oscillator Compensation on chip
—Internal feedback resistor and compensation
capacitors
—64 position Digitally Controlled Trim Capacitor
—6 digital frequency adjustment settings to
±30ppm
• Battery Switch or Super Cap Input
• 2-Wire™ Interface interoperable with I2C*
—400kHz data transfer rate
• Low Power CMOS
—1.25µA Operating Current (Typical)
• Small Package Options
—8-Lead SOIC and 8-Lead TSSOP
APPLICATIONS
• Utility Meters
• HVAC Equipment
• Audio / Video Components
• Set Top Box / Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers / PDA
• POS Equipment
• Test Meters / Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial / Medical / Automotive
DESCRIPTION
The X1205 device is a Real Time Clock with clock/
calendar, two polled alarms, oscillator compensation,
and battery backup switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. All compensation and trim components are
integrated on the chip. This eliminates several external
discrete components and a trim capacitor, saving
board area and component cost.
The Real-Time Clock keeps track of time with separate
registers for Hours, Minutes, and Seconds. The
Calendar has separate registers for Date, Month, Year
and Day-of-week. The calendar is correct through
2099, with automatic leap year correction.
BLOCK DIAGRAM
OSC
Compensation
32.768kHz
X1
X2
Oscillator
Frequency 1Hz
Divider
Timer
Calendar
Logic
Time
Keeping
Registers
(SRAM)
SCL
SDA
Serial
Interface
Decoder
IRQ
Control
Decode
Logic
8
*I2C is a Trademark of Philips.
REV 1.0.9 8/29/02
Control
Registers
(EEPROM)
Status
Registers
(SRAM)
Interrupt Enable
Alarm
www.xicor.com
Alarm
Compare
Alarm Regs
(EEPROM)
Characteristics subject to change without notice. 1 of 22






X1205 Datasheet, Funktion
X1205 – Preliminary Information
INTERRUPT CONTROL REGISTER (INT)
Interrupt Control and Status Bits (IM, AL1E, AL0E)
There are two Interrupt Control bits, Alarm 1 Interrupt
Enable (AL1E) and Alarm 0 Interrupt Enable (AL0E) to
specifically enable or disable the alarm interrupt signal
output (IRQ). The interrupts are enabled when either the
AL1E and AL0E bits are set to “1”, respectively.
Two volatile bits (AL1 and AL0), associated with the two
alarms respectively, indicate if an alarm has happened.
These bits are set on an alarm condition regardless of
whether the IRQ interrupt is enabled. The AL1 and AL0
bits in the status register are reset by the falling edge of
the eighth clock of a read of the register containing the
bits.
Pulse Interrupt Mode
The pulsed interrupt mode allows for repetitive or
recurring alarm functionality. Hence an repetitive or
recurring alarm can be set for every nth second, or nth
minute, or nth hour, or nth date, or for the same day of
the week. The pulsed interrupt mode can be consid-
ered a repetitive interrupt mode, with the repetition
rate set by the time setting fo the alarm.
The Pulse Interrupt Mode is enabled when the IM bit is
set.
IM Bit
0
1
Interrupt / Alarm Frequency
Single Time Event Set By Alarm
Repetitive / Recurring Time Event Set By Alarm
The Alarm IRQ output will output a single pulse of
short duration (approximately 10-40ms) once the
alarm condition is met. If the interrupt mode bit (IM bit)
is set, then this pulse will be periodic.
ON-CHIP OSCILLATOR COMPENSATION
Digital Trimming Register (DTR) — DTR2, DTR1
and DTR0 (Non-Volatile)
The digital trimming Bits DTR2, DTR1 and DTR0
adjust the number of counts per second and average
the ppm error to achieve better accuracy.
DTR2 is a sign bit. DTR2=0 means frequency
compensation is > 0. DTR2=1 means frequency
compensation is < 0.
DTR1 and DTR0 are scale bits. DTR1 gives 10 ppm
adjustment and DTR0 gives 20 ppm adjustment.
A range from -30ppm to +30ppm can be represented
by using three bits above.
Table 3. Digital Trimming Registers
DTR Register
Estimated frequency
DTR2 DTR1 DTR0
PPM
000
0 (default)
010
001
+10
+20
011
+30
100
110
0
-10
101
-20
111
-30
Analog Trimming Register (ATR) (Non-volatile)
Six analog trimming Bits from ATR5 to ATR0 are pro-
vided to adjust the on-chip loading capacitance range.
The on-chip load capacitance ranges from 3.25pF to
18.75pF. Each bit has a different weight for capaci-
tance adjustment. In addition, using a Citizen CFS-206
crystal with different ATR bit combinations provides an
estimated ppm range from +116ppm to -37ppm to the
nominal frequency compensation. The combination of
digital and analog trimming can give up to +146ppm
adjustment.
The on-chip capacitance can be calculated as follows:
CATR = [(ATR value, decimal) x 0.25pF] + 11.0pF
Note that the ATR values are in two’s complement,
with ATR(000000) = 11.0pF, so the entire range runs
from 3.25pF to 18.75pF in 0.25pF steps.
The values calculated above are typical, and total load
capacitance seen by the crystal will include approxi-
mately 2pF of package and board capacitance in addi-
tion to the ATR value.
See Application section and Xicor’s Application Note
AN154 for more information.
REV 1.0.9 8/29/02
www.xicor.com
Characteristics subject to change without notice. 6 of 22

6 Page









X1205 pdf, datenblatt
X1205 – Preliminary Information
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................... -65°C to +135°C
Storage Temperature......................... -65°C to +150°C
Voltage on VCC, VBACK and IRQ
pin (respect to ground) ............................-0.5V to 7.0V
Voltage on SCL, SDA, X1 and X2
pin (respect to ground) ............... -0.5V to 7.0V or 0.5V
above VCC or VBACK (whichever is higher)
DC Output Current .............................................. 5 mA
Lead Temperature (Soldering, 10 sec) ...............300°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation
of the device at these or any other conditions above
those indicated in the operational sections of this
specification is not implied. Exposure to absolute max-
imum rating conditions for extended periods may affect
device reliability.
DC OPERATING CHARACTERISTICS (Temperature = -40°C to +85°C, unless otherwise stated.)
Symbol
VCC
VBACK
VCB
VBC
Parameter
Main Power Supply
Backup Power Supply
Switch to Backup Supply
Switch to Main Supply
Conditions Min Typ Max Unit
2.7 5.5 V
1.8 5.5 V
VBACK -0.2
VBACK
VBACK -0.1
VBACK +0.2
V
V
Notes
OPERATING CHARACTERISTICS
Symbol
ICC1
Parameter
Read Active Supply
Current
ICC2
Program Supply Current
(nonvolatile)
ICC3
Main Timekeeping
Current
IBACK
ILI
ILO
Timekeeping Current
Input Leakage Current
Output Leakage Current
Conditions
VCC = 2.7V
VCC = 5.5V
VCC = 2.7V
VCC = 5.5V
VCC = 2.7V
VCC = 5.5V
VBACK = 1.8V
VBACK = 3.3V
Min
VIL Input LOW Voltage
-0.5
VIH
VHYS
VOL
Input HIGH Voltage
Schmitt Trigger Input
Hysteresis
Output LOW Voltage for
SDA/IRQ
VCC related level
VCC = 2.7V
VCC = 5.5V
VCC x 0.7 or
VBACK x 0.7
.05 x VCC or
.05 x VBACK
Typ
1.25
1.5
Max
400
800
2.5
3.0
5
10
10
10
VCC x 0.2 or
VBACK x 0.2
VCC + 0.5 or
VBACK + 0.5
Unit
µA
µA
mA
mA
µA
µA
µA
µA
µA
µA
V
V
Notes
1, 5, 7, 14
2, 5, 7, 14
3, 7, 8, 14, 15
3, 6, 9, 14, 15
“See Perfor-
mance Data”
10
10
13
13
V 13
0.4
V
0.4
11
REV 1.0.9 8/29/02
www.xicor.com
Characteristics subject to change without notice. 12 of 22

12 Page





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