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| 型号： | ADM00421 |
| 厂商： | Microchip Technology |
| 文件页数： | 56/82页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION MCP2210 |
| 产品培训模块： | MCP2210 Evaluation Kit |
| 设计资源： | ADM00421 BOM |
| 标准包装： | 1 |
| 主要目的： | 接口，USB 至 SPI |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP2210 |
| 主要属性： | 全速（12Mbps） |
| 次要属性： | USB 供电 |
| 已供物品： | 2 板，线缆 |
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MCP2210
DS22288A-page 6
2011 Microchip Technology Inc.
In order to meet the inrush current requirements of the
USB 2.0 specifications, the total effective capacitance
appearing across VBUS and ground must be no more
than 10 F. If it is more than 10 F, some kind of inrush
limiting is required. For more details on Inrush Current
Limiting, see the current Universal Serial Bus Specifi-
cation.
According to the USB 2.0 specification, all USB devices
must also support a Low-Power Suspend mode. In the
USB Suspend mode, devices must consume no more
than 500 A (or 2.5 mA for high powered devices that
are remote wake-up capable) from the 5V VBUS line of
the USB cable.
The host signals the USB device to enter Suspend
mode by stopping all USB traffic to that device for more
than 3 ms.
The USB bus provides a 5V voltage. However, the USB
transceiver requires 3.3V for the signaling (on D+ and
D- lines).
During USB Suspend mode, the D+ or D- pull-up resis-
tor must remain active, which will consume some of the
allowed suspend current budget (500 A/2.5 mA).
The VUSB pin is required to have an external bypass
capacitor. It is recommended that the capacitor be a
ceramic cap, between 0.22 and 0.47 F.
Figure 1-3 shows a circuit where the MCP2210 internal
LDO is used to provide 3.3V to the USB transceiver.
The voltage on the VDD affects the voltage levels onto
the GP and SPI module pins (GP8-GP0, MOSI, MISO
and SCK). With VDD at 5V, these pins will have a logic
‘1’ of 5V with the variations specified in Section 4.1
FIGURE 1-3:
TYPICAL POWER SUPPLY
OPTION USING THE 5V
PROVIDED BY THE USB
1.5.2.3
3.3V – Self Powered
Typically, many embedded applications are using 3.3V
or lower power supplies. When such an option is avail-
able in the target system, MCP2210 can be powered
up (VDD) from the existing power supply rail. The typi-
cal connections for MCP2210 powered from 3.3V rail
are shown in Figure 1-4.
In this example MCP2210 has both VDD and VUSB lines
tied to the 3.3V rail. These tied connections disable the
internal USB transceiver LDO of the MCP2210 to
regulate the power supply on VUSB pin. Another
consequence is that the ‘1’ logical level on the GP and
SPI pins will be at the 3.3V level, in accordance with the
variations
specified
in
FIGURE 1-4:
USING AN EXTERNALLY
PROVIDED 3.3V POWER
SUPPLY
LDO
3.3V
USB
Transceiver
D+
VDD
VUSB
D-
IN
OUT
5V (USB Bus)
or external
power supply
LDO
3.3V
D+
VDD
VUSB
D-
IN
OUT
5V (USB Bus)
or external
power supply
External
USB
Transceiver
3.3V
LDO
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