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参数资料
| 型号： | MAX5935EAX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/44页 |
| 文件大小： | 700K |
| 描述： | IC CTRLR POWER QUAD 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 类型： | 以太网供电控制器（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 无 |
| 电源电压： | -32 V ~ -60 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 管件 |
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The MAX5935 also features three other undervoltage
and overvoltage interrupts: V
EE
undervoltage interrupt
(V
EEUV
), V
DD
undervoltage interrupt (V
DDUV
), and V
DD
overvoltage interrupt (V
DDOV
). A fault latches into the
supply events register (Table 11), but the MAX5935
does not shut down the ports with a V
EEUV
, V
DDUV
, or
V
DDOV
.
DC Disconnect Monitoring
Setting R13h[DCD_EN_] bits high enables DC load
monitoring during normal powered state. If SENSE_
falls below the DC load disconnect threshold, V
DCTH
,
for more than t
DISC
, the device turns off power and
asserts the LD_DISC_ bit of the corresponding port.
t
DISC
is programmable using R16h[0-1] and R27h[0-3].
AC Disconnect Monitoring
The MAX5935 features AC load disconnect monitoring.
Connect an external sine wave to OSC_IN. The oscilla-
tor requirements are:
" Frequency x V
P-P
= 200V
P-P
x Hz ?5%
" Positive peak voltage > +2V
" Frequency > 60Hz
" A 100Hz ?0%, 2V
P-P
?%, with +1.2V offset
(V
PEAK
= +2.2V, typ) is recommended.
The MAX5935 buffers and amplifies 3x the external
oscillator signal and sends the signal to DET_, where
the sine wave is AC-coupled to the output. The
MAX5935 senses the presence of the load by monitor-
ing the amplitude of the AC current returned to DET_
(see the Functional Diagram).
Setting R13h[ACD_EN_] bits high enable AC load dis-
connect monitoring during the normal powered state. If
the AC current peak at the DET_ pin falls below I
ACTH
for more than t
DISC
, the device turns off power and
asserts the LD_DISC_ bit of the corresponding port.
I
ACTH
is programmable using R23h[0-3].
An internal comparator checks for a proper amplitude
of the oscillator input. If the positive peak of the input
sinusoid falls below a safety value of 2V, OSC_FAIL
sets and the port shuts down. Power cannot be applied
to the ports when ACD_EN is set high and OSC_FAIL is
set high. Leave OSC_IN unconnected or connect it to
DGND when not using AC disconnect detection.
When using the AC disconnect detection feature, con-
nect AGND directly to DNGD as close as possible to
the IC. The MAX5935 also requires a V
DD
of greater
than +3V for this function. See the Typical Application
Circuit with AC disconnect for other external compo-
nent requirements.
Thermal Shutdown
If the MAX5935 die temperature reaches +150癈, an
overtemperature fault generates and the MAX5935
shuts down and the MOSFETs turn off. The die temper-
ature of the MAX5935 must cool down below +130癈 to
remove the overtemperature fault condition. After a
thermal shutdown, the part is reset.
Address Inputs
A3, A2, A1, and A0 represent the four LSBs of the chip
address, the complete seven bits chip address (see
Table 3).
The four LSBs latch on the low-to-high transition of
RESET or after a power-supply start (either on V
DD
or
V
EE
). Address inputs default high through an internal
50k& pullup resistor to V
DD
. The MAX5935 also
responds to the call through a global address 60h (see
the Global Addressing and Alert Response Protocol
section).
I
2
C-Compatible Serial Interface
The MAX5935 operates as a slave that sends and
receives data through an I
2
C-compatible, 2-wire or 3-
wire interface. The interface uses a serial data input line
(SDAIN), a serial data output line (SDAOUT) and a seri-
al clock line (SCL) to achieve bidirectional communica-
tion between master(s) and slave(s). A master (typically
a microcontroller) initiates all data transfers to and from
the MAX5935, and generates the SCL clock that syn-
chronizes the data transfer. In most applications, con-
nect the SDAIN and the SDAOUT lines together to form
the serial data line (SDA).
Using the separate input and output data lines allows
optocoupling with the controller bus when an isolated
supply powers the microcontroller.
The MAX5935 SDAIN line operates as input. The
MAX5935 SDAOUT operates as an open-drain output.
A pullup resistor, typically 4.7k&, is required on
SDAOUT. The MAX5935 SCL line operates only as an
input. A pullup resistor, typically 4.7k&, is required on
SCL if there are multiple masters, or if the master in a
single-master system has an open-drain SCL output.
Serial Addressing
Each transmission consists of a START condition (Figure
7) sent by a master, followed by the MAX5935 7-bit slave
address plus R/W bit, a register address byte, one or
more data bytes, and finally a STOP condition.
Quad Network Power Controller
for Power-Over-LAN
18 ______________________________________________________________________________________
0
1
0
A3
A2
A1
A0
R/W
Table 3. MAX5935 Address
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5935EAX+ | 功能描述:热插拔功率分布 Quad Network Power Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5935EAX+T | 功能描述:热插拔功率分布 Quad Network Power Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5935EAX-T | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5936AAESA | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5936AAESA+ | 功能描述:热插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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