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參數(shù)資料
| 型號： | MAX3301EEBA-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | CLAMP |
| 中文描述： | LINE TRANSCEIVER, PBGA25 |
| 封裝： | 5 X 5 MM, UCSP-25 |
| 文件頁數(shù)： | 14/33頁 |
| 文件大小： | 935K |
| 代理商： | MAX3301EEBA-T |
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M
USB On-the-Go Transceiver and Charge Pump
14
______________________________________________________________________________________
MODE
I
2
C
ID_IN
sess_end
COMP
sess _vld
COMP
vbus_ vld
COMP
cr_int
COMP
dp_hi
COMP
dm_hi
COMP
TRM
TX
DIFF
RX
SE
RX
Shutdown
1
X
X
X
X
X
X
X
X
X
X
X
Interrupt
Shutdown
2
Suspend
3
X
X
X
X
X
X
X
X
Normal
Operating
Table 1. Functional Blocks Enabled During Specific Operating Modes
= Enabled.
X
= Disabled.
1. Enter shutdown mode by writing a 1 to sdwn (bit 0 of special-function register 2).
2. Enter interrupt shutdown mode by writing a 1 to int_sdwn (bit 0 of special-function register 1).
3. Enter suspend mode by writing a 1 to spd_susp_ctl (bit 1 of special-function register 1) and suspend (bit 1 of control register 1), or
by writing a 0 to spd_susp_ctl (bit 1 of special-function register 1) and driving SUS high.
ID_IN
The USB OTG specification defines an ID input that
determines which dual-role device is the default host.
An OTG cable connects ID to ground in the connector
of one end and is left unconnected in the other end.
Whichever dual-role device receives the grounded end
becomes the A device. The MAX3301E provides an
internal pullup resistor on ID_IN. Internal comparators
detect if ID_IN is grounded or left floating.
Interrupt Logic
When OTG events require action, the MAX3301E pro-
vides an interrupt output signal on
INT
. Alternatively,
OE/INT
can be configured to act as an interrupt output
while the device operates in USB suspend mode.
Program
INT
and
OE/INT
as open-drain or push-pull
interrupts with irq_mode (bit 1 of special-function regis-
ter 2, see Table 15).
V
BUS
Power Control
V
BUS
is a dual-function port that powers the USB bus
and/or provides a power source for the internal linear reg-
ulator. The V
BUS
power-control block performs the various
switching functions required by an OTG dual-role device.
These actions are programmed by the system logic using
bits 5 to 7 of control register 2 (see Table 8) to:
Discharge V
BUS
through a resistor
Provide power-on or receive power from V
BUS
Charge V
BUS
through a resistor
The OTG supplement allows an A device to turn V
BUS
off when the bus is not being used to conserve power.
The B device can issue a request that a new session be
started using SRP. The B device must discharge V
BUS
to a level below the session-end threshold (0.8V) to
ensure that no session is in progress before initiating
SRP. Setting bit 6 of control register 2 to a 1, discharges
V
BUS
to GND through a 5k
current-limiting resistor.
When V
BUS
has discharged, the resistor is removed
from the circuit by resetting bit 6 of control register 2.
An OTG A device is required to supply power on V
BUS
.
The MAX3301E provides power to V
BUS
from V
CC
or
from the internal charge pump. Set bit 5 in control regis-
ter 2 to a 1 in both cases. Bit 5 in control register 2 con-
trols a current-limited switch, preventing damage to the
device in the event of a V
BUS
short circuit.
An OTG B device (peripheral mode) can request a ses-
sion using SRP. One of the steps in implementing SRP
requires pulsing V
BUS
high for a controlled time. A 930
resistor limits the current according to the OTG specifi-
cation. Pulse V
BUS
through the pullup resistor by assert-
ing bit 7 of control register 2. Prior to pulsing V
BUS
(bit
7), a B device first connects an internal pulldown resis-
tor to discharge V
BUS
below the session-end threshold.
The discharge current is limited by the 5k
resistor and
set by bit 6 of control register 2. An OTG A device must
supply 5V power and at least 8mA on V
BUS
. Setting bit
5 of control register 2 turns on the V
BUS
charge pump.
Operating Modes
The MAX3301E has four operating modes to optimize
power consumption. Only the I
2
C interface remains active
in shutdown mode, reducing supply current to 1μA. The
I
2
C interface, the ID_IN port, and the session-valid com-
parator all remain active in interrupt shutdown mode. RCV
asserts low in suspend mode; however, all other circuitry
remains active. Table 1 lists the active blocks’ power in
each of the operating modes.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3301EETI+ | 制造商:Maxim Integrated Products 功能描述:USB ON-THE-GO TRANSCEIVERS AND CHARGE PUMPS - Rail/Tube |
| MAX3301EETJ | 功能描述:USB 接口集成電路 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| MAX3301EETJ+ | 功能描述:USB 接口集成電路 USB On-the-Go Tcvr & Charge Pump RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| MAX3301EETJ+GH7 | 功能描述:USB 接口集成電路 USB On-the-Go Transceiver and Charge Pump RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| MAX3301EETJ+T | 功能描述:USB 接口集成電路 USB On-the-Go Tcvr & Charge Pump RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
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