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参数资料
| 型号： | ADM1041AARQZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/64页 |
| 文件大小： | 0K |
| 描述： | IC SECONDARY SIDE CTRLR 24QSOP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,000 |
| 应用： | 次级侧控制器 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 6mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
| 配用： | ADM1041-EVAL-ND - BOARD EVALUATION ADM1041 |
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ADM1041
Notes on SMBus Read Operations
The SMBus interface of the ASIC cannot load the SMBUS if no
power is applied to the ASIC. This requirement allows a power
supply to be disconnected from the ac supply while still installed
in a power subsystem.
When using the SMBus interface, a write always consists of the
ADM1041 SMBus interface address byte, followed by the
internal address register byte, and then the data byte. There are
two cases for a read:
If more than one device is asserting an alert, all alerting devices
try to respond with their slave addresses, but an arbitration
process ensures that only the lowest slave address is received by
the master. If the slave device has its alert configured as latching,
it sends a command via the SMBus to clear the latch. The master
should then check if the alert line is still asserted, and, if so,
repeat the ARA call to service the next alert. Note that an alerting
slave does not respond to an ARA call unless it is configured in
SMBus mode (not AC_OKLink/PS ON LINK) and up_pson_m is
set. The ADM1041 supports the SMBus (ARA) function.
?
?
If the internal address register is known to be at the desired
address, simply read the ASIC with the SMBus interface
address byte, followed by the data byte read from the ASIC.
The internal address pointer increments if a block mode
operation is in progress; data values of 0 are returned if the
register address limit of 7Fh is exceeded, or if unused
registers in the address range 00h to 7Fh are accessed. If
the address register is pointing at EEPROM memory, that
is 8000h, and the address reaches its limit of 80FFh, it does
not roll over to Address 8100h on the next access.
Additional accesses do not increment the address pointer,
all reads return 00h, and all writes complete normally but
do not change any internal register or EEPROM location. If
the address register is pointing at EEPROM memory, that
is 81xxh, and the address reaches its limit of 813Fh, it does
not roll over to Address 8140h on the next access.
Additional accesses do not increment the address pointer,
all reads return 00h, and all writes complete normally but
not change any internal register or EEPROM location. Note
that for byte reads, the internal address does not auto
increment.
If the internal address register value is unknown, write to
the ADM1041 with the SMBus interface address byte,
followed by the internal address register byte. Then restart
the serial communication with a read consisting of the
SMBus interface address byte, followed by the data byte
read from the ADM1041.
SUPPORT FOR SMBus 1.1
SMBus 1.1 optionally adds a CRC8 frame check sequence to
check if transmissions are received correctly. This is particularly
useful for long block read/write EEPROM operations, when the
SMBus is heavily loaded or in a noisy environment. The CRC8
frame can be used to guarantee reliability of the EEPROM.
LAYOUT CONSIDERATIONS
Noise coupling into the digital lines (greater than 150 mV),
overshoot greater than V CC and undershoot less than GND may
prevent successful SMBus communication with the ADM1041.
SMBus No Acknowledge is the most common symptom,
causing unnecessary traffic on the bus. Although the SMBus
maximum frequency of communication is rather low (400 kHz
max), care still needs to be taken to ensure proper termination
within a system with multiple parts on the bus and long printed
circuit board traces. A 5.1 k? resistor can be added in series
with the SDA and SCL lines to help filter noise and ringing.
Minimize noise coupling by keeping digital traces out of
switching power supply areas and ensure that digital lines
containing high speed data communications cross at right
angles to the SDA and SCL lines.
POWER-UP AUTO-CONFIGURATION
After power-up or reset, the ADM1041 automatically reads the
content of a 32-byte block of EEPROM memory that starts at
8100h and transfers the contents into the appropriate trim-level
and control registers (00h to 1Bh). In this way, the ADM1041
can be preconfigured with the desired operating characteristics
without the host system having to download the data over the
SMBus ALERT RESPONSE ADDRESS (ARA)
The ADM1041’s CBD/ALERT pin can be configured to respond
to a variety of fault signals and can be used as an interrupt to a
microprocessor. The pins from several ADM1041s may be wire-
ORed. When the SMBus master (microprocessor) detects an
SMBus. This does not preclude the possibility of modifying the
configuration during normal operation.
power-up or power-on reset.
alert request, it normally needs to read the alert status of each
device to identify the source of the alert.
The SMBus ARA provides an easier method to locate the source
of a such an alert. When the master receives an alert, it can send
a general call address (0001100) over the bus. The device assert-
EEPROM
POWER UP
RAM
CONFIGURATION
REGISTERS
DIGITAL
TRIM
POTS
DIGITAL
TIMING
CONTROL
ing the alert responds by returning its own slave address to the
master.
Rev. A | Page 39 of 64
Figure 37. EEPROM Download
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1041A-EVALZ | 功能描述:BOARD EVAL FOR ADM1041A RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADM1041ARQ | 功能描述:IC PWR SUPP MON/LOAD SHAR 24QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM1041ARQ-2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADM1041ARQ-REEL | 制造商:AD 制造商全称:Analog Devices 功能描述:Secondary-Side Controller with Current Share and Housekeeping |
| ADM1041ARQ-REEL7 | 功能描述:IC PWR SUP MON/LOAD SHARE 24QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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