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| 型号： | MIC2341-2YTQ TR |
| 厂商： | Micrel Inc |
| 文件页数： | 23/32页 |
| 文件大小： | 1277K |
| 描述： | IC HOT PLUG CTLR DUAL PCI 48TQFP |
| 标准包装： | 2,000 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 3.3V，12V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
MIC2341/2341R
October 2007
23
M9999-102507-A
(408) 944-0800
Figure 7. MIC2341R Auto-Retry Timing Diagram and Operation in Current-limit
Thermal Shutdown
The internal VAUX[A/B] MOSFETs are protected against
damage not only by current limiting, but by
overtemperature protection as well. Should an
overcurrent condition on either VAUX[A] or VAUX[B]
raise the junction temperature of the MIC2341 to 140癈,
all of the outputs for that corresponding slot (including
VAUX) will be shut off and that slots /FAULT_AUX
output will be asserted. The slots /FAULT_MAIN output
will not be asserted. The other slots operating condition
will remain unaffected. However, should the MIC2341s
die temperature exceed 160癈 because of an
overcurrent fault condition on both VAUX[A] and
VAUX[B], both slots (all outputs, including VAUXA and
VAUXB) will be shut off. In this case, both
/FAULT_AUX[A/B] output signals will be asserted; the
/FAULT_MAIN[A/B] output signals will not be asserted.
Plug-in Card Retention Switch Inputs
Two pins on the MIC2341 are available for use as card
retention switch inputs, /CRSW[A/B]. These pins are
internally pulled-up by 45k& resistors to VSTBY and
prevent the enabling of all gate drive circuits on
12GATE[A/B], 3VGATE[A/B], and VAUX[A/B] unless
these input pins are asserted LOW. In addition, each of
these inputs exhibits an internal debounce delay time of
approximately 10ms.
/FORCE_ON[A/B] Inputs
These level sensitive, asserted active-low digital inputs
are internally pulled up to VSTBY through a weak
current source and are intended for diagnostics during
the debug phase of the system design involving the
MIC2341. In asserting /FORCE_ON[A/B] LOW, all three
of the respective slots outputs (+12V, +3.3V, and VAUX)
will turn on. However, all protections for those outputs
are disabled. This explicitly includes all overcurrent and
short circuit protections, and on-chip thermal protection
for the VAUX supplies. Additionally, asserting a slots
/FORCE_ON[A/B] input will disable all of its input and
output UVLO protections, with the sole exception of that
asserting either or both of the /FORCE_ON[A/B] inputs
will not disable the VSTBY[A/B] input UVLO.
Asserting /FORCE_ON[A/B] LOW will cause the
respective slots /PWRGD[A/B], and /DLY_PWRGD[A/B]
output signals to be asserted LOW while the
/FAULT_MAIN[A/B], the /FAULT_AUX[A/B}, the /INT,
and the SYSPWRGD output signals to enter their open-
drain state.
/PWRGD[A/B] and /DLY_PWRGD Digital Outputs
The MIC2341 has two /PWRGD outputs and two
/DLY_PWRGD outputs, one for each slot. These are
open-drain, active-low outputs that are activated after
power-on-reset and are normally connected by an
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| MIC2342-2YTQ TR | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug 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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