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參數(shù)資料
| 型號： | DS17887-3 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, DMA24 |
| 封裝： | PLASTIC, MODULE, DIP-24 |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 343K |
| 代理商： | DS17887-3 |
MAX3816A
I2C 2-Wire Extender for DDC in DVI,
HDMI, and VGA Interfaces
8
_______________________________________________________________________________________
LOW
STATE
HIGH
STATE
CLOCK_D > 17.5% AND CLOCK_C > 12.5%
CLOCK_C “OR” CLOCK_D < 75%
NOTES:
1) STATE CHANGE CONDITIONS ARE IN ITALICS. TRANSITION ACTIONS ARE UNDERLINED.
2) THE DATA CHANNEL STATE MACHINE IS IDENTICAL AND SYMMETRIC, EXCEPT THAT HOLDOFF TIME IS 2.0
μs INSTEAD OF 2.5μs.
ALSO, IN ADDITION TO THE 85% CONDITION TO EXIT STATE 6, DATA HAS AN ADDITIONAL EXIT: DATA_C “OR” DATA_D < 60%.
3) DEPENDENT ON MODE PIN 16: MODE = LOW FOR SERIAL OPERATION (DRIVERS HOLD); MODE = HIGH FOR PARALLEL OPERATION (DRIVERS OFF).
HOLDOFF TIMER = START
5
SENSE OFF
DRIVERS ON
6
SENSE OFF
DRIVERS OFF
4
SENSE ON
(NOTE 3)
RAMP
UP
RAMP
DOWN
3
SENSE OFF
(NOTE 3)
1
SENSE ON
DRIVERS OFF
2
SENSE OFF
DRIVERS ON
HOLDOFF TIMER = 1.75 s
μ
HOLDOFF TIMER = 1.75 s
μ
HOLDOFF TIMER
≥ 2.5 s
“AND”
CLOCK_C “AND” CLOCK_D > 85%
μ
HOLDOFF TIMER = 2.5 s
μ
Figure 1a. Clock State Machine Diagram
Locally, connect a 47k
Ω pullup resistor from CLOCK_C
and DATA_C to VCC. This assumes that a 1.65k
Ω
pullup resistor resides at the opposite end of each
channel.
Display Drivers
The display drivers (Figure 11) are typical open-drain
pulldown devices capable of discharging up to 400pF
of capacitive load within the I2C fall-time limits.
Locally, connect a 2.2k
Ω pullup resistor from CLOCK_D
and DATA_D to VDD for VDD = 3.3V, or a 3.3k
Ω pullup
resistor to VDD for VDD = 5V.
Level Sense
The MAX3816A’s level-sensing circuitry monitors the
incoming data for state transitions. When the CLOCK or
DATA signal is high and drops below VTRIGIH, the con-
troller ramps the outputs low. When the DATA and
CLOCK are low and both rise above VTRIGIL, refer-
enced to GND_REF on the source side or VSS on the
display side, the output drives the level high.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17887-3+ | 功能描述:實時時鐘 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS17887-3IND | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17887-3-IND | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS17887-3IND+ | 功能描述:實時時鐘 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS17887-5 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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