DS1089LU-21G(2005) 데이터 시트보기 (PDF) - Maxim Integrated
부품명
상세내역
일치하는 목록
DS1089LU-21G Datasheet PDF : 12 Pages
| |||
3.3V Center Spread-Spectrum EconOscillator™
Block Diagram
PDN
OE
SDA
SCL
VCC
GND
SPRD
H/W GATED OUTPUT
I2C SERIAL
INTERFACE
I2C
ADDRESS
BITS
CONTROL REGISTERS
S/W GATED OUTPUT
WRITE EE
COMMAND
ADDR
J3 J2 OE X WC A2 A1 A0
EEPROM
WRITE
CONTROL
EEPROM
DITHER RATE
DITHER %
VCC
J1 J0 LO/ X P3 P2 P1 P0
HIZ
PRESCALER
DS1089L
OUTPUT CONTROL
FACTORY-
PROGRAMMED
MASTER
OSCILLATOR
33.3MHz TO
66.6MHz
f MOD
PRESCALER
fMOSC
fOSC SYNCED
fOUT
DIVIDE BY 1, 2, 4,
OUTPUT
OUT
8, 16, 32, 64,
BUFFER
128, OR 256
TRIANGLE-
WAVE
GENERATOR
fMOSC
PRESCALER SETTING
OUTPUT CONFIGURATION
Detailed Description
Master Oscillator
The internal master oscillator is capable of generating a
square wave with a 33.3MHz to 66.6MHz frequency
range. The master oscillator frequency (fMOSC) is factory
programmed, and is specified in the Ordering Information.
Prescaler
The user can program the prescaler divider to produce
an output frequency (fOUT) as low as 130kHz using bits
P0, P1, P2, and P3 in the PRESCALER register. The
output frequency can be calculated using Equation 1.
Any value programmed greater than 28 will be decod-
ed as 28. See Table 1 for prescaler divider settings.
Equation 1
Output Frequency (Hz) fOSC
=
fMOSC
2x
where x = P3, P2, P1, P0
Table 1. Prescaler Divider Settings
BITS P3, P2,
2x =
P1, P0
0000
1
0001
2
0010
4
0011
8
0100
16
0101
32
0110
64
0111
128
1000
256
fOUT = fOSC
fMOSC
fMOSC / 2
fMOSC / 4
fMOSC / 8
fMOSC / 16
fMOSC / 32
fMOSC / 64
fMOSC / 128
fMOSC / 256
1111
256
fMOSC / 256
_____________________________________________________________________ 7
Share Link: 