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參數(shù)資料
| 型號： | MIC2555-1YML TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 3/29頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX OTG USB BUS UNIV 24MLF |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/0 |
| 規(guī)程： | USB 2.0 |
| 電源電壓： | 3 V ~ 4.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，24-MLF? |
| 供應(yīng)商設(shè)備封裝： | 24-MLF?（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 1113 (CN2011-ZH PDF) |
| 其它名稱： | 576-1088-6 |
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Micrel, Inc.
MIC2555
December 2006
11
M9999-121406
UART mode
There are two UART modes of operation:
Direct UART:
-
UART TX
SE0_VM_TX pin, data is output on D-
-
UART RX
DAT_VP_RX pin receives UART data from
D+.
Secondary UART:
-
UART TX
GPIO_1_TX pin, data is output on D-
-
UART RX
GPOI_0_RX pin, received from D+.
Conditions for UART mode:
uart_en = 1
speed = 1
uart_io = Direct UART = 0
Secondary UART inputs (GPIO) = 1
Note:
It is not necessary to reset uart_io when switching from
UART to USB mode; uart_io is deactivated when
uart_en = 0, so its setting will not effect DAT_VP_RX or
SE0_VM_TX’s operation in USB mode.
Audio Mode
There is one mode of Audio operation. In audio mode,
the MIC2555’s D+ and D- outputs are Tri-Stated (high
impedance) and the OTG controller or system
components can send and receive audio signals via the
D+, D- lines. The MIC2555 will monitor the D+ line for
voltages crossing one of two levels, as a means of
detecting a car kit interrupt signal. These interrupt events
are captured and flagged by the Serial Controller.
Conditions:
uart_en = 0
OE_INT/ = 1
cr_int_sel = detect @ 3.0V = 1
detect @ 0.5V = 0
Note:
The MIC2555 has no provision to connect or disconnect
audio devices from the D+, D- lines, so the designer is
cautioned to be sure that when the MIC2555 is operating
as a data transceiver, no damage will ensue if the
system’s audio components are exposed to USB or
UART digital signal levels.
Power Management
The transceiver’s power modes are:
Active power
:
All functions active, transceiver fully powered.
Conditions:
suspend = 0
pwr_dn = 0
Suspend power
:
The differential transmitter and receiver are turned off to
conserve power but the USB interface is still active (i.e.,
pull-ups and pull-downs still active, VBUS generation on,
etc.).
Conditions:
suspend = 1
pwr_dn = 0
Power Down:
Only the serial interface is still active and the transceiver
is able to detect SRP. The ID pin sensing may be turned
on or off with a control bit in the control registers.
Conditions:
suspend = 1
pwr_dn = 1
Control Bit
Functions Powered Down
By Control Bit
suspend
pwr_dn
cp_off
Differential Driver
●
Differential Receiver
●
UART TXD
●
D+ interrupt comparators
●
VBUS Comparators
●
VTRM LDO
●
VBUS output
●
Internal biasing circuits and
band gap reference
●
Charge Pump off
●
Power Management Table
Note:
Suspend
and
Power-Down
bits
operate
independently of each other. Activating Power-Down
does not automatically invoke Suspend.
For lowest power operation Suspend, Power-Down and
Charge Pump OFF modes must be activated:
Conditions:
suspend = 1
pwr_dn = 1
cp_off = 1
Circuits still operating:
ID detect and D- receiver continue to function.
This includes the ID comparators, ID pull-up
circuits, and D- data receiver.
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