收藏本站
X
X
R
R
P
P
7
7
7
7
0
0
8
8
 
 
a
a
n
n
d
d
 
 
X
X
R
R
P
P
7
7
7
7
4
4
0
0
 
 
Q
Q
u
u
a
a
d
d
 
 
C
C
h
h
a
a
n
n
n
n
e
e
l
l
 
 
D
D
i
i
g
g
i
i
t
t
a
a
l
l
 
 
P
P
W
W
M
M
 
 
S
S
t
t
e
e
p
p
 
 
D
D
o
o
w
w
n
n
 
 
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
e
r
r
s
s
 
 
 
?2012 Exar Corporation
21/28
Rev. 1.2.2
appropriate bit combination the user can configure the IC to function as a master or a slave when
two or more XRP7708s are used to convert power in a system. Automatic clock selection is also
provided to allow operation even if the external clock fails by switching the IC back to an internal
clock.
External Clock Synchronization
Even when configured to use an external clock, the chip initially powers up with its internal clock.
The user can set the percent target that the frequency detector will use when comparing the
internal clock with the clock frequency input on the GPIO pin. If the external clock frequency is
detected to be within the window specified by the user, then a switchover will occur to the external
clock. If the IC does not find a clock in the specified frequency target range then the external clock
will not be used and the IC will run on the internal clock that was specified by the user. If the
external clock fails the user can chose to have the internal clock take over, using the automatic
switch back mode in the SET_SYNC_MODE_CONFIG register.
 
XRP7708
Configured for
external clock use
CLK_IN
GPIO1
 
Fig. 22:XRP7708 Configured For External Clock Use
Synchronized Operation as a Master and Slave Unit
Two XRP7708s can be synchronized together. This Master-Slave configuration is described below.
"    Master
When the XRP7708 powers up as a master unit after the internal configuration memory is loaded
the unit will send CLK_OUT and SYNC_OUT signals to the slave on the preconfigured GPIO pins.
"    Slave
When powering in sync mode the slave unit will initially power up with its internal clock to transfer
the configuration memory. Once this transfer occurs, then the unit is set to function as a slave unit.
In turn the unit will take the external clock provided by the master to run as its main internal clock.
GPIO2
GPIO2
XRP7708
configured
as a master
XRP7708
configured
as a slave
CLK_OUT
SYNC_OUT
SYNC_IN
CLK_IN
GPIO1
GPIO1
 
Fig. 23: Master/Slave Configuration of the XRP7708
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
XRP7740ILBTR-F IC REG 5OUT BCK/LINEAR 40TQFN
ZDS1009TA IC CURRENT MIRROR SOT223-8
ZXCT1008FTA IC CURRENT MONITOR 1% SOT23-3
ZXCT1009T8TA IC CURRENT MONITOR 1% SM8
ZXCT1010E5TA IC CURRENT MONITOR 1% SOT-23-5
ZXCT1011E5TA IC CURRENT MONITOR 1% SOT23-5
ZXCT1012DAATA IC CURRENT MONITOR 2.5% 5TDFN
ZXCT1020E5TA IC CURRENT MONITOR 1% SOT23-5
相关代理商/技术参数
XRP7740ILB-AAAA-F 制造商:EXAR 制造商全称:EXAR 功能描述:Quad-Output Digital PWM Buck Controller Supporting high current loads
XRP7740ILB-F 功能描述:软开关 PWM 控制器 4Ch Digital Pwr Cntr w/LDO prog. thru I2C RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
XRP7740ILBTR-AAAA-F 制造商:EXAR 制造商全称:EXAR 功能描述:Quad-Output Digital PWM Buck Controller Supporting high current loads
XRP7740ILBTR-F 功能描述:软开关 PWM 控制器 4Ch Digital Pwr Cntr w/LDO prog. thru I2C RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
XRP77XXEVB-XCM 功能描述:EVAL BOARD W/USB-I2C FOR XRP7704 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
XRP77XXEVB-XPM 功能描述:电源管理IC开发工具 XRP77XXEVB-XPM RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
XRP9710EVB 制造商:Exar Corporation 功能描述:Evaluation Board for the XRP9710 Series Dual 6 A Programmable Power Module 制造商:Exar Corporation 功能描述:XRP9710 eval
XRP9710EVB-DEMO-1 功能描述:XRP9710 - DC/DC, Step Down 2, Non-Isolated Outputs Evaluation Board 制造商:exar corporation 系列:- 零件状态:有效 主要用途:DC/DC，步降 输出和类型:2，非隔离 功率 - 输出:- 电压 - 输出:1.8V，2.5V 电流 - 输出:6A，6A 电压 - 输入:5.5 V ~ 22 V 稳压器拓扑:降压 频率 - 开关:- 板类型:完全填充 所含物品:板 使用的 IC/零件:XRP9710 标准包装:1