MAXQ612 Maxim, MAXQ612 Datasheet - Page 18

• Manufacturer Part Number: MAXQ612
• Description: The MAXQ612/MAXQ622 are low-power, 16-bit MAXQ® microcontrollers designed for low-power applications including universal remote controls, consumer electronics, and white goods
• Manufacturer: Maxim

16-Bit Microcontrollers with
Infrared Module and Optional USB
18
8, 30, 45, 73
MAXQ612
_____________________________________________________________________________________
28
29
21
31
32
—
—
—
—
—
PIN
8, 23, 30, 45,
MAXQ622
28
73
29
21
31
32
25
22
24
26
27
HFXOUT
REG18
RESET
NAME
HFXIN
V
V
V
GND
V
DDIO
DM
DP
DDB
BUS
DD
Supply Voltage
Ground
Regulator Capacitor. This pin must be connected to ground through a 1.0FF
external ceramic-chip capacitor. The capacitor must be placed as close to this
pin as possible. No external devices other than the capacitor should be con-
nected to this pin.
Digital, Active-Low, Reset Input/Output. The CPU is held in reset when this pin is
low and begins executing from the reset vector when released. The pin includes
pullup current source and should be driven by an open-drain, external source
capable of sinking in excess of 4mA. This pin is driven low as an output when an
internal reset condition occurs.
High-Frequency Crystal Input. Connect an external crystal or resonator between
HFXIN and HFXOUT as the high-frequency system clock. Alternatively, HFXIN is
the input for an external, high-frequency clock source when HFXOUT is shorted
to ground during POR.
USB V
Bypass V
as possible.
USB D+ Signal. This bidirectional pin carries the positive differential data or
single-ended data. Connect this pin to a USB “B” connector. This pin is weakly
pulled high internally when the USB is disabled.
USB D- Signal. This bidirectional pin carries the negative differential data or
single-ended data. Connect this pin to a USB “B” connector. This pin is weakly
pulled high internally when the USB is disabled.
USB Transceiver Supply Voltage. This is the power output of the internal voltage
regulator that is used for the USB transceiver (3.3V) block. This pin is bypassed
to ground with a 1.0FF capacitor as close as possible to the package. No exter-
nal circuitry should be powered from this pin.
Switched 3V Power Supply. This is the power output after selection between
V
capacitor must be placed as close to this pin as possible. No external devices
other than the capacitor should be connected to this pin.
BUS
USB FUNCTION PINS
and V
BUS
POWER PINS
BUS
CLOCK PINS
RESET PINS
Supply Voltage. Connect V
DD
to ground with a 1.0FF ceramic capacitor as close to the V
. Must be connected to an external ceramic chip capacitor. The
Pin Descriptions—Bare Die
FUNCTION
BUS
to a positive 5.0V power supply.
BUS
pin