MIC2555
USB – OTG Transceiver
General Description
MIC2555 is a USB On-The-Go (OTG) transceiver
designed to enable intelligent self-powered devices to
communicate on a peer-to-peer basis with other USB and
USB OTG enabled devices. Designed to perform as a
PHY for USB Serial Interface Engines (SIE), MIC2555 is
compatible with a wide variety of stand-alone OTG SIE
chips, OTG IP cores (used in ASIC and COT designs), and
Application Specific Standard Products (ASSPs).
MIC2555 is fully compliant to USB-IF’s
Universal Serial
Bus Specification 2.0
and the
On-The-Go Supplement Rev
1.0a,
for Low speed and Full speed operation, and allows
dual-role device (DRD) operation via an I
2
C based
controller interface. The controller’s robust register set
permits full control over bus and interface activity for
transacting Session Request Protocol (SRP) and Host
Negation Protocol (HNP) sequences.
Messaging between Host and Target devices can utilize
either USB or UART signaling methods. Additionally, the
MIC2555 permits audio signaling on its D+, D- and ID lines
in support of analog car kit applications.
USB communication is complemented with on-chip D+, D-
pull-up/pull-down resistors, an integrated charge pump and
low dropout voltage regulators to provide stable internal
supply voltages and to supply V
BUS
power when operating
as an A-device. Logic input levels spanning 1.6V to 4.5V
ensure compatibility with current and future generations of
process technology.
The MIC2555 is offered in a space saving 4mm x 4mm 24-
pin MLF™ package. Data sheets and support
documentation can be found on Micrel’s web site at
www.micrel.com.
Features
•
•
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Complies with USB-IF USB standard 2.0 and OTG
supplement Revision 1.0a.
Provides signaling and control logic for SRP and
HNP, enabling USB Dual-role device operation.
Designed for Full-speed and Low-speed USB
communications.
I
2
C controller interface.
Offers 3 modes of operation:
-
USB
-
UART
-
Audio
Operates with V
LOGIC
of 1.6V – 4.5V, assuring
compatibility with low voltage ASICs.
Tri-level ID detection for recognition of USB and
non-USB devices.
Supports USB /Car Kit audio interface.
Allows Single-ended and Differential Logic I/O.
Integrated charge pump for V
BUS
supply.
On-chip pull-up, pull-down resistors minimize
external component count.
Suspend and Power-down modes for power
conservation.
Operates over the full Industrial Temperature
range: –40
°
C to +85
°
C.
Cellular Telephones
PDAs
Digital Still Cameras
Camcorders
Data Cradles
CD and MP3 players
Printers
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Applications
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MicroLead
Frame and MLF are trademarks of Amkor Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2005
M9999-060805
(408) 955-1690
Micrel, Inc.
MIC2555
Ordering Information
Part Number
Standard
Pb-Free
Address
Junction Temp. Range
Package
MIC2555BML-0
MIC2555BML-1
MIC2555YML-0
MIC2555YML-1
0x
1x
–40°C to +85°C
–40°C to +85°C
24-pin MLF™
24-pin MLF™
Typical Application
V
CC
System
Supply Voltage
V
DD
V
BAT
V
DD_LOGIC
OE_INT/
RCV
MIC2555
DAT_VP_RX
SE0_VM_TX
SCL
SDA
CAP+
0.22µF
CAP-
V
TRM
V
BUS
ID
RS
D+
D–
RS
V
BUS
USB SIE
Controller
D+
D–
GND
USB
Port
GND CAP++
10µF
220µF
4.7µF
MIC2555 Typical Application Circuit
Pin Configuration
VDD_LGC
GND_A
CAP-
VBAT
CAP+
CAP++
RCV
SE0_VM_TX
DAT_VP_RX
OE_INT/
INT/
GPIO_0_RX
GPIO_1_TX
SCL
SDA
ADR0
RESET/
GPIO_2
VTRM
VBUS
D-
D+
ID
GND_D
4mm × 4mm 24-pin MLF (ML)
June 2005
2
M9999-060805
(408) 955-1690
Micrel, Inc.
MIC2555
Pin Description
Pin Number
1
2
Type
O
I/O
Pin Name
RCV
SE0_VM_TX
Pin Description
Output from differential receiver.
= SE0 in USB DAT-SE0 mode
= VM in VP-VM mode.
= UART Transmit output when in UART Mode
See figures 1 and 2 on page 4
= DAT in USB DAT-SE0 mode.
= VP in VP-VM mode
= UART Receive input when in UART mode
See figures 1 and 2 on page 4
A Multi-mode pin controlling various functions in conjunction with
control register bits. A logic LOW on this pin gives the following
results:
= OE (Output Enable): Enables D+, D- as USB outputs.
= INT/ (Interrupt): Active LOW output when register bits ‘suspend’ and
‘oe_int_en’ both = 1.
Interrupt (bar). Open Drain Active LOW output. May be wire-ORed
with other interrupt signals.
= General purpose I/O. Open drain output.
= Alternate UART Receive input.
See figures 1 and 2 on page 4
= General purpose I/O. Open drain output.
= Alternate UART Transmit output.
See figures 1 and 2 on page 4
2
I C Clock
I
2
C Data
2
Sets Address bit A0 of I C controller. This pin is a digital input and
must not be left floating.
System reset. Active LOW.
General purpose I/O. Open drain output.
System Digital ground.
Identification input. Monitors the ID pin of the USB connector and
indicates both the presence of a device and type (USB or not USB).
= USB D+ when in USB mode.
= UART Receive in UART mode.
= Right Speaker audio output in stereo mode.
= Microphone signal from Car Kit.
= USB D- when in USB mode.
= UART Transmit out in UART mode.
= Left Speaker audio output in stereo mode.
= Monaural audio output to Car Kit.
USB 5V power.
Internal 3.3V supply. Sets USB signal levels.
Positive lead for charge pump reservoir capacitor.
Positive lead for charge pump capacitor.
Positive voltage from battery. Supplies power to MIC2555 internal
circuitry and power for charge pump when driving VBUS.
Negative lead for charge pump capacitor.
Analog ground. Isolated Charge Pump ground.
Logic supply voltage. Used to set logic levels between MIC2555 and
System Controller / ASIC.
3
I/O
DAT_VP_RX
4
I/O
OE_INT/
5
6
O
I/O
INT/
GPIO_0_RX
7
8
9
10
11
12
13
14
I/O
I/O
I/O
I
I
I/O
I/O
I/O
GPIO_1_TX
SCL
SDA
ADR_0
RESET/
GPIO_2
GND_D
ID
15
I/O
D+
16
17
18
19
20
21
22
23
24
I/O
I/O
I/O
I
I
I
I
I
I
D-
VBUS
VTRM
CAP++
CAP+
VBAT
CAP-
GND_A
VDD_LGC
June 2005
3
M9999-060805
(408) 955-1690
Micrel, Inc.
MIC2555
Interconnect Diagrams
Host Controller
1
MIC2555
SIE
I C
2:1
2
SE0_VM_TX
DAT_VP_RX
D+
D–
UART
TX
RX
UART
Figure 1. Controller with Multiplexed Serial Interfaces
Host Controller
1
MIC2555
SIE
I C
2
SE0_VM_TX
DAT_VP_RX
D+
D–
UART
TX
RX
UART
GPIO_0_RX
GPIO_1_TX
Figure 2. Controller with Parallel Serial Interfaces
NOTE 1
Examples of Host Controller are:
Baseband Processor/IC
µProcessor
Modem
June 2005
4
M9999-060805
(408) 955-1690
Micrel, Inc.
MIC2555
Absolute Maximum Ratings
(1)
Power Supply Voltage:
V
BAT, GPIO-
................................................. -0.3V to +6.0V
V
DD_LGC
.........................................
–0.3V to +6.0V and
≤
V
BAT
USB Bus Voltage
V
BUS
......................................................................
–0.3V to +6.0V
V
DD_LGC
.........................................
–0.3V to +6.0V and
≤
V
BUS
Voltage On Any Other Pin............................ –0.3V to +4.5V
Current Into/Out of Any Pin .......................................±10mA
Junction Temperature ................................................ 150°C
Storage Temperature .................................–65
°
C to +150
°
C
ESD Ratings:..............................................V
BUS
, D+, D
–
, ID
Human Body Model .............................................. 15 kV
ESD Ratings:................................................... All other pins
Human Body Model ................................................ 2 kV
Operating Ratings
(2)
Power Supply Voltage:
V
BUS
.......................................................... 4.4V to 5.25V
V
BAT
............................................................ 3.0V to 4.5V
Operating Temperature................................ –40
°
C to +85
°
C
Package Thermal Resistance .................................. 49
°
C/W
Electrical Characteristics
(3)
Test condition is 25
°
C unless otherwise specified.
Bold
indicates -40
°
C + 85
°
C,
V
BAT
= 3.6V, V
DD_LGC
= 3.6V, V
BUS
= 5.0V, V
TRM
= 1µF, C+ = 0.22µF, C++ = 220µF, C
VBUS
= 10µF
Symbol
Parameter
Condition
Min
3.0
1.6
I
TRM
≤
2.5mA, 3.0 < V
BAT
< 3.6V
Power Down mode
Suspend mode
Full Speed, Idle, D+
≥
2.8V, D-
≤
0.3V, I
VBUS
= 0mA
Full Speed Transmitting 12Mb/s,
C
LOAD
≤
350pF on D+, D-, I
VBUS
= 0mA
Full Speed Transmitting 12Mb/s,
C
L
= 50pF on D+,D-, I
VBUS
= 0mA
Low Speed Transmitting 1.5Mb/s,
C
L
= 350pF on D+,D-, I
VBUS
= 0mA
Suspend mode, OE_INT/ = 1
OE_INT/ = 1
2.8
3.3
13
140
2.8
17
2.5
6.5
80
7
Typ
Max
4.5
V
BAT
3.6
20
250
5.0
40
6
12
100
15
Units
V
V
V
µA
µA
mA
mA
mA
mA
µA
µA
Power Supplies
V
BAT
System Supply Voltage
V
DD_LGC
V
TRM
I
BAT_PD
I
BAT_SUS
I
BAT_FS_I
I
BAT_FS_HC
I
BAT_FS_LC
I
BAT_LS_HC
I
VBUS_S
I
VDD_LGC
Logic Supply Voltage
Termination Voltage (internal
supply voltage)
System Supply Current
System Supply Current
System Supply Current
System Supply Current
System Supply Current
System Supply Current
Current drawn by System
from V
BUS
Current drawn by System for
core logic
Voltage Output to V
BUS
V
BUS
Output Current
B device SRP Pull-up
Resistor on V
BUS
B device SRP Pull-down
Resistor on V
BUS
Charge Pump and V
BUS
V
BUS_ OUT
I
VBUS
R
VBUS_PU
R
VBUS_PD
I
BUS
= 10mA, V
BAT
= 3.0V
4.4V
≤
V
BUS
≤
5.25V
Pull-up voltage = V
TRM
Pull-down to GND
4.4
10
281
675
5.0
27
1300
2300
7500
7500
5.25
V
mA
Ω
Ω
June 2005
5
M9999-060805
(408) 955-1690
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