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DS1089LU-866+

P1-P3P4-P6P7-P9P10-P12
DS1089L
WRITE EE Command
The WRITE EE command is useful in closed-loop appli-
cations where the registers are frequently written. In
applications where the register contents are frequently
written, the WC bit should be set to 1 to prevent wear-
ing out the EEPROM. Regardless of the value of the WC
bit, the value of the ADDR register is always written
immediately to EEPROM. When the WRITE EE com-
mand has been received, the contents of the registers
are written into the EEPROM, thus locking in the regis-
ter settings.
3.3V Center Spread-Spectrum EconOscillator™
10 ____________________________________________________________________
STOP
CONDITION
OR REPEATED
START
CONDITION
REPEATED IF MORE BYTES
ARE TRANSFERRED
ACK
START
CONDITION
ACK
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
SIGNAL FROM RECEIVER
SLAVE ADDRESS
MSB
SCL
SDA
R/W
DIRECTION
BIT
12 678 9 12 893–7
Figure 3. I
2
C Data Transfer Protocol
1
0
1
1
R/W
A0
A1
A2
MSB
LSB
DEVICE
IDENTIFIER
DEVICE
ADDRESS
READ/WRITE BIT
Figure 4. Slave Address Byte
I
2
C Serial Port Operation
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
____________________________________________________________________ 11
SDA
SCL
t
HD:STA
t
LOW
t
HIGH
t
R
t
F
t
BUF
t
HD:DAT
t
SU:DAT
REPEATED
START
t
SU:STA
t
HD:STA
t
SU:STO
t
SP
STOP START
Figure 5. I
2
C AC Characteristics
SLAVE
ACK
10 1
1
R/WA0*A1*
SLAVE
ACK
A2*
MSB
LSB
DEVICE IDENTIFIER
DEVICE
ADDRESS
READ/
WRITE
MSB LSB
COMMAND/REGISTER ADDRESS
SLAVE
ACK
MSB LSB
b7 b6 b5 b4 b3 b2 b1 b0
SLAVE
ACK
STOP
*THE ADDRESS DETERMINED BY A0, A1, AND A2 MUST
MATCH THE ADDRESS SET IN THE ADDR REGISTER.
DATA
TYPICAL I
2
C WRITE TRANSACTION
EXAMPLE I
2
C TRANSACTIONS (WHEN A0, A1, AND A2 ARE ZERO)
A) SINGLE BYTE WRITE
-WRITE PRESCALER
REGISTER TO 128
B) SINGLE BYTE READ
-READ PRESCALER
REGISTER
START
START
START
B0h
B0h
SLAVE
ACK
SLAVE
ACK
02h
02h
SLAVE
ACK
SLAVE
ACK
DATA
SLAVE
ACK
STOP
10110000
10110000
b7 b6 b5 b4 b3 b2 b1 b0
00000010 10000000
10000000
00000010
REPEATED
START
DATA
MASTER
NACK
STOP
SLAVE
ACK
10110001
B1h
Figure 6. I
2
C Transactions
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1089L,
decouple the power supply with 0.01µF and 0.1µF
high-quality, ceramic, surface-mount capacitors.
Surface-mount components minimize lead inductance,
which improves performance, and ceramic capacitors
tend to have adequate high-frequency response for
decoupling applications. These capacitors should be
placed as close to the V
CC
and GND pins as possible.
Stand-Alone Mode
SCL and SDA cannot be left floating even in stand-
alone mode. If the DS1089L will never need to be pro-
grammed in-circuit, including during production
testing, SDA and SCL can be connected high.
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
is a registered trademark of Dallas Semiconductor Corporation.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo
.
Chip Topology
TRANSISTOR COUNT: 5985
SUBSTRATE CONNECTED TO GROUND
PDN
OEGND
1
2
8
7
SCL
SDA
SPRD
V
CC
OUT
µSOP (118 mils)
TOP VIEW
3
4
6
5
DS1089L
Pin Configuration
OUT
SPRD
GND
OE
PDN
SDA
SCL
V
CC
V
CC
V
CC
V
CC
4.7kΩ
4.7kΩ
2-WIRE
INTERFACE
DITHERED 130kHz
TO 66.6MHz OUTPUT
DECOUPLING CAPACITORS
(0.1µF and 0.01µF)
*SDA AND SCL CAN BE CONNECTED DIRECTLY HIGH IF THE DS1089L NEVER
NEEDS TO BE PROGRAMMED IN-CIRCUIT, INCLUDING DURING PRODUCTION TESTING.
DS1089L
OUT
N.C.
SPRD
GND
OE
PDN
SDA*
SCL*
V
CC
V
CC
V
CC
DITHERED 130kHz
TO 66.6MHz OUTPUT
XTL2/OSC2
XTL1/OSC1
MICROPROCESSOR
DECOUPLING CAPACITORS
(0.1µF and 0.01µF)
DS1089L
Typical Operating Circuits
PROCESSOR-CONTROLLED MODE
STAND-ALONE MODE
P1-P3P4-P6P7-P9P10-P12

DS1089LU-866+

Mfr. #:
Buy DS1089LU-866+
Manufacturer:
Maxim Integrated
Description:
Clock Generators & Support Products 3.3V Center Spread Spctrm EconOscillatr
Lifecycle:
New from this manufacturer.
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