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参数资料
| 型号： | MAX3353EEUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC CHARGE PUMP USB OTG 16TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 充电泵，USB |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 2 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
USB On-the-Go Charge Pump with Switchable
Pullup/Pulldown Resistors
The MAX3353E also has a special feature that allows it
to control the timing of the V BUS pulse.
Since an OTG device could be plugged into a PC, the
V BUS pulse must be particularly well controlled to prevent
damage to a PC host. For this reason, V BUS pulsing is
done by turning on and off a current source. The V BUS
pulse must be timed so it drives a 13μF load (when it is
connected to the A Device) to a voltage greater than
2.1V, and it drives a >96μF load (when it is connected to
a standard PC) to a voltage less than 2.0V.
Firmware can control the current source and the timing
of the V BUS pulse through the V BUS_CHG2 control bit.
The MAX3353E also has the capability to time the pulse
itself. Firmware initiates the self-timed V BUS pulse by
setting the V BUS_CHG1 control bit to 1.
The internal timer and current generator guarantee that
the V BUS voltage goes above 2.1V if C VBUS < 13μF
within 90ms and stands below 2.0V if C VBUS > 96μF.
Once the time has elapsed, if another V BUS pulse is
required, it is necessary to clear the V BUS_CHG1 bit and
then set it again.
Note: SRP V BUS pulsing and its associated current gen-
erator work only if the MAX3353E is not in shutdown.
Data-Line Pullup and Pulldown Resistance
For OTG operation, D+ and D- are connected to switch-
able pulldown resistors (host) and switchable pullup
V TRM
1.5k Ω
SW2
BIT 4 BIT 5 SW1 SW2
0 0 OPEN OPEN
0 1 OPEN CLOSED
1 0 CLOSED OPEN
1 1 CLOSED OPEN
SW1
D+
D-
resistors (peripheral). Data-line pullup/pulldown resistors
are individually controlled through data bits 4 through 7 in
control register 1. Two 15k Ω pulldown resistors allow the
device to be set as a host and are asserted by bits 6 and
7. The 1.5k Ω pullup resistor is applied to the data lines
through SW1 and SW2, which are controlled by bits 4 and
5. D+ pullup has higher priority to avoid direct connection
of D+ and D-. Each of the control bits controls a designat-
ed switch; therefore, pullup and pulldown switches can
be asserted at the same time. A simplified schematic of
the switching network is shown in Figure 3.
15k Ω
SW4
15k Ω
SW3
GND
The bidirectional D+ and D- lines are ESD protected to
±15kV, reducing external components in many applications.
Applications Information
2-Wire I 2 C-Compatible Serial Interface
A register file that interfaces to the control logic uses a
simple 2-wire interface operating up to 400kHz to con-
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
trol the various switches and modes.
Serial Addressing
DEFAULT
(POWER ON)
VALUES
CONTROL REGISTER 1
NOTE: SWITCHES ARE SHOWN IN THEIR DEFAULT
(POWER-ON) POSITIONS. A "1" CLOSES A SWITCH.
The MAX3353E operates as a slave that sends and
receives control and status signals through an I 2 C-
compatible 2-wire interface. The interface uses a serial
data line (SDA) and a serial clock line (SCL) to achieve
Figure 3. Pullup and Pulldown Resistors Network
SCL
t HD:STA
t F
t LOW
t SU:DAT
t R
t HIGH
t HD:DAT
t SU:STO
SDA
t BUF
Figure 4. 2-Wire Serial Interface Timing Details
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3353EEWP+ | 制造商:Maxim Integrated Products 功能描述:USB ON-THE-GO CHARGE PUMP WITH SWITCHABLE PULLUP/PULLDOWN RE - Rail/Tube |
| MAX3353EEWP+T | 制造商:Maxim Integrated Products 功能描述:USB ON-THE-GO CHARGE PUMP WITH SWITCHABLE PULLUP/PULLDOWN RE - Tape and Reel |
| MAX3355EEBC | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX3355EEBC+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP AND COMPARATORS - Rail/Tube |
| MAX3355EEBC+T | 功能描述:电荷泵 USB On-the-Go Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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