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| 型号： | SMS66FR14 |
| 厂商： | Summit Microelectronics, Inc. |
| 英文描述： | Six-Channel Power Supply Supervisor and Cacsade Sequence Controller |
| 中文描述： | 6通道电源监控和Cacsade序控制器 |
| 文件页数： | 12/26页 |
| 文件大小： | 1039K |
| 代理商： | SMS66FR14 |
SMS66
Preliminary Information
Summit Microelectronics, Inc
2070 1.0 7/16/03
12
APPLICATIONS INFORMATION
DEVICE OPERATION
POWER SUPPLY
The SMS66 can be powered by either a 12V input
through the 12VIN pin or by a 3.3V or 5.0V input
through the VDD pin. The 12VIN pin feeds an internal
programmable regulator that internally generates
either 5.5V or 3.6V. A voltage arbitration circuit allows
the device to be powered by the highest voltage from
either the regulator output or the VDD input. This
voltage arbitration circuit continuously checks for these
voltages to determine which will power the SMS66.
The resultant internal power supply rail is connected to
the VDD_CAP pin that allows both filtering and hold-
up of the internal power supply.
MODES OF OPERATION
The SMS66 has three basic modes of operation:
Power-on sequencing mode, monitoring mode, and
Power-off sequencing mode (shown in Figures 4B
through 4E). In addition, there is a forced shutdown
feature. A detailed description of each mode and
feature follows.
POWER-ON SEQUENCING
The SMS66 can be programmed to sequence up to six
power supplies in any order. Each of these six
channels (A-F) has an associated open drain PUP
output that, when connected to a converter’s enable
pin, controls the turn-on of the converter. The
channels are assigned sequence positions to
determine the order of the sequence. Any channel
can also be programmed to not take part in the
sequencing in applications with fewer than six
supplies. The polarity of each of the PUP
X
outputs is
programmable for use with various types of
converters.
Power-on sequencing can be initiated by the
PWR_ON/OFF pin or via I
2
C control. The polarity of
the PWR_ON/OFF pin is programmable. If hard wired
in its active state the SMS66 will automatically initiate
the Power-on sequence. Otherwise, toggling the
PWR_ON/OFF pin to its active state will initiate the
Power-on sequence. To enable software control of
the sequencing feature, the SMS66 offers an I
2
C
command to initiate Power-on sequencing while the
PWR_ON/OFF pin is in its inactive state.
Figure 4D:
SMS66 Sequence-On Waveforms
Time/Horizontal division = 40mS
Ch 1(500mV/Div) = 3.3V DC-DC converter output (Yellow trace)
Ch 2 (500mV/Div) = 2.5V DC-DC converter output (Blue trace)
Ch 3 (500mV/Div) = 1.8V DC-DC converter output (Purple trace)
Ch 4 (500mV/Div) = 1.5V DC-DC converter output (Green trace)
Figure 4E SMS66 Sequence-Off Waveforms
Time/Horizontal division = 400mS
Ch 1(500mV/Div) = 3.3V DC-DC converter output (Yellow trace)
Ch 2 (500mV/Div) = 2.5V DC-DC converter output (Blue trace)
Ch 3 (500mV/Div) = 1.8V DC-DC converter output (Purple trace)
Ch 4 (500mV/Div) = 1.5V DC-DC converter output (Green trace)
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相关代理商/技术参数 |
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| SMS66FR15 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Power Supply Supervisor and Cacsade Sequence Controller |
| SMS69273-91NF | 制造商:Laird Technologies Inc 功能描述:ANTENNA BROADBAND/OMNI SMD |
| SMS69273-91TNM | 功能描述:829MHz, 2.2GHz GSM, LTE, UMTS Dome RF Antenna 698MHz ~ 960MHz, 1.71GHz ~ 2.7GHz 0.8dBi, 0.2dBi Connector, TNC Male Panel Mount 制造商:laird technologies ias 系列:- 包装:散装 零件状态:有效 频率组:宽带 频率（中心/带）:829MHz，2.2GHz 频率范围:698MHz ~ 960MHz，1.71GHz ~ 2.7GHz 天线类型:圆顶 频带数:2 VSWR:2 回波损耗:- 增益:0.8dBi，0.2dBi 功率 - 最大值:3W 特性:- 端接:连接器，TNC 公型 侵入防护:- 安装类型:面板安装 高度（最大值）:3.425"（87.00mm） 应用:GSM，LTE，UMTS 标准包装:1 |
| SMS6CSB1 | 功能描述:集管和线壳 Protection Shroud 6P Pnl Mnt Pin Recpt RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| SMS6GE3 | 功能描述:集管和线壳 6P Socket Straight Boardmount RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
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