MAX3420EETG+ Maxim Integrated Products, MAX3420EETG+ Datasheet - Page 20
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MAX3420EETG+
Manufacturer Part Number
MAX3420EETG+
Description
IC USB PERIPH CONTROLLER 24TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX3420EETG.pdf
(22 pages)
Specifications of MAX3420EETG+
Controller Type
USB Peripheral Controller
Interface
USB/Serial
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
15mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Input Voltage Range (max)
3.6 V
Maximum Operating Temperature
+ 85 C
Maximum Power Dissipation
1667 mW
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Operating Supply Voltage
1.7 V to 3.6 V
Propagation Delay Time
14.2 ns
Supply Current (max)
30 mA
For Use With
MAX3420EEVKIT-2+ - EVAL KIT FOR MAX3420E
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The V
MAX3420E feature. Because the µP is powered
whether the USB device is plugged in or not, it needs
some way to detect a plug-in event. A comparator
inside the MAX3420E checks for a valid V
tion on VBCOMP and provides a connect status bit to
the µP. Once connected, the µP can delay the logical
connection to the USB bus to perform any required ini-
tialization, and then connect by setting the CONNECT
bit to 1 in the MAX3420E register USBCTL (R15). This
connects the internal 1.5kΩ resistor from D+ to V
signal the host that a device has been plugged in.
If a host turns off V
the USB rev. 2.0 specification requires that the device
must not power its 1.5kΩ pullup resistor connected to
D+. The MAX3420E has two features to help service
this event. First, the NOVBUSIRQ bit indicates the loss
of V
(V
pullup resistor anytime V
the CONNECT bit setting.
USB Peripheral Controller
with SPI Interface
Figure 17. MAX3420E in a Self-Powered Application
20
BUS
BUS
______________________________________________________________________________________
BUS
gate) to instruct the MAX3420E to disconnect the
. Second, the µP can set a bit called VBGATE
"B" CONNECTOR
detect input, VBCOMP, is an important
USB
BUS
V
GND
BUS
while the device is connected,
BUS
D+
D-
goes away, regardless of
CERAMIC
33Ω
33Ω
1.0μF
BUS
CERAMIC
1.0μF
connec-
RES
D+
D-
VBCOMP
CC
V
CC
, to
V
GND
L
0.1μF
The MAX3420E requires a crystal with the following
specifications:
Frequency: 12MHz ±0.25%
C
C
Drive level: 200µW
Series resonance resistance: 60Ω max
Note: Series resonance resistance is the resistance
observed when the resonator is in the series resonant
condition. This is a parameter often stated by quartz crys-
tal vendors and is called R1. When a resonator is used in
the parallel resonant mode with an external load capaci-
tance, as is the case with the MAX3420E oscillator circuit,
the effective resistance is sometimes stated. This effec-
tive resistance at the loaded frequency of oscillation is:
For typical C
tance can be greater than R1 by a factor of 2.
MAX3420E
LOAD
O
: 7pF max
: 18pF
GPIN
4
C
XI
GPIO
O
R1 x ( 1 + (C
GPOUT
XI
and C
12MHz
4
XO
MOSI
MISO
SCLK
LOAD
GPX
C
INT
SS
XO
O
values, the effective resis-
/ C
N.C.
N.C.
LOAD
Crystal Selection
))
+3.3V
μP
2