- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385505 > LTC1699-81 (Linear Technology Corporation) SMBus VID Voltage Programmers(SMBus接口 VID電壓編程器) PDF資料下載
參數(shù)資料
| 型號： | LTC1699-81 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | SMBus VID Voltage Programmers(SMBus接口 VID電壓編程器) |
| 中文描述： | VID電壓編程的SMBus（西元的SMBus接口電壓編程器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LTC1699-81 |
LTC1699 Series
13
APPLICATIU
W
U
U
Register 1. After issuing the final acknowledgement bit,
the SMBus interface returns to an idle state and waits for
the next start bit.
Read Word Protocol
The Read Word protocol starts off like Write Word proto-
col but after the command code acknowledgment, the
microprocessor issues a second start bit (called a re-
peated start). This is followed by the slave address but with
the R/W bit set high to indicate that data direction is now
from the LTC1699-80, LTC1699-81 or LTC1699-82 to the
microprocessor. The LTC1699-80, LTC1699-81 or
LTC1699-82 then acknowledges the slave address and
clocks the contents of Register 0 (Data Low byte) to the
microprocessor. The Data Low byte is acknowledged by
the microprocessor. On detecting the acknowledgment
bit, the LTC1699-80, LTC1699-81 or LTC1699-82 clocks
out the contents of Register 1 (Data High byte). As defined
in the SMBus specifications, the microprocessor does not
acknowledge the last data byte. The LTC1699-80,
LTC1699-81 or LTC1699-82 enters an idle state to wait for
the next start bit after clocking out the Data High byte. The
five most significant bits (VID0-VID4) of the Data Low and
High bytes are the resistor divider settings previously
loaded using the Setup protocol. The next bit below the
VID0-VID4 bits is the status of the DCON signal. If this bit
is low (high), the DC/DC converters are switched on (off).
The two unused, least significant bits of the Data Low and
Data High bytes are clocked out as zeros which removes
the need to mask out these bits in software.
Safeguards
The LTC1699-80, LTC1699-81 and LTC1699-82 provide
safeguards against incorrect divider codes and the unin-
tentional turn-on or turn-off of the DC/DC converters.
Incorrect codes due to bus conflicts during Setup proto-
cols can cause damage to circuits powered by the DC/DC
converters. The safeguards built into the LTC1699-80,
LTC1699-81 and LTC1699-82 include Read-Back, re-
peated On and Off protocols, ignoring On protocols if the
registers have not been setup, locking out registers while
the DC/DC converters are operating and latching in VID
codes only in Setup protocols.
After power-up, the microprocessor must set up the
registers before the LTC1699-80, LTC1699-81 and
LTC1699-82 recognizes On protocols. This requirement
ensures that the correct DC/DC converter output is pro-
grammed before the converters are turned on. After setup,
Read-Back allows the contents of Registers 0 and 1 to be
verified in case the VID codes were corrupted by noise or
bus conflicts.
In order to turn on the DC/DC converter, two On protocols
must be sent to slave address E2H without any other (E2H)
protocols in between. Protocols to other slave addresses
are still allowed and are ignored. Similarly, two Off proto-
cols must be sent to slave address E2H to turn the
converters off. The On and Off protocols are monitored by
an internal state machine. The output of the state machine,
SMBON, is high after two On commands and low after two
Off commands. Repeated On and Off protocols reduce the
chances of bus conflicts and noise turning the converter
on or off accidentally. In both On and Off protocols, the
LTC1699-80, LTC1699-81 and LTC1699-82, do not latch
in the Data Low and Data High bytes. This protects the
settings that have already been loaded into the registers
and verified by read-back.
Once the converters are turned on (both SMBON and
VRON are high) the contents of Registers 0 and 1 are
protected and can only be altered with Setup protocols if
VRON is pulled low or two Off protocols are sent to the
LTC1699-80, LTC1699-81 or LTC1699-82 (to force SMBON
low).
DC/DC Converter Control
The LTC1699-80, LTC1699-81 and LTC1699-82 provide
six pins for DC/DC converter control: SEL, VRON, CPU_ON,
IO_ON, CLK_ON and PGOOD. These pins (except SEL) and
the output of the internal on/off state machine (SMBON)
determine if the DC/DC converters are operating or in
shutdown.
The SEL and VRON pins are TTL compatible, high imped-
ance inputs with a logic threshold of 1.3V over the entire
2.7V to 5.5V supply range. They are compatible with 3.3V
logic and have
±
50mV of hysterisis for noise rejection.
When pulled high or low, the SEL pin selects Register 1
and 0 respectively as the active divider setting. The VRON
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1699-82 | SMBus VID Voltage Programmers(SMBus 接口VID電壓編程器) |
| LTC1701 | Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70 |
| LTC1701ES5 | Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70 |
| LTC1703 | Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70 |
| LTC1703CG | Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1699EGN-80 | 功能描述:IC PROGRAMMER VOLT SMBUS 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC1699EGN-80#PBF | 功能描述:IC PROGRAMMER VOLT SMBUS 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LTC1699EGN-80#TR | 功能描述:IC PROGRAMMER VOLT SMBUS 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC1699EGN-80#TRPBF | 功能描述:IC PROGRAMMER VOLT SMBUS 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LTC1699EGN-81 | 功能描述:IC PROGRAMMER VOLT SMBUS 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。