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PDF MAXQ617 Data sheet ( Hoja de datos )
| Número de pieza | MAXQ617 | |
| Descripción | Infrared Remote Control System-on-Chip | |
| Fabricantes | Maxim Integrated | |
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MAXQ617
Infrared Remote Control System-on-Chip
General Description
The MAXQ617 is a low-power, 16-bit MAXQ® microcon-
troller designed for low-power applications including
universal remote controls, consumer electronics, and
white goods. The device combines a powerful 16-bit
RISC microcontroller and integrated peripherals includ-
ing a universal synchronous/asynchronous receiver-
transmitter (USART), an SPI master/slave and two I2C
communications ports, along with an IR module with car-
rier frequency generation and flexible port I/O capable
of multiplexed keypad control. An internal amplifier
eliminates the need for external circuitry to drive the IR
receiver pin.
The device includes 80KB of flash memory and 4KB of
data SRAM.
For the ultimate in low-power battery-operated perfor-
mance, the device includes an ultra-low-power stop mode
(0.2µA typ). In this mode, the minimum amount of circuitry
is powered. Wake-up sources include external interrupts,
the power-fail interrupt, and a timer interrupt. The micro-
controller runs from a wide 1.67V to 3.6V operating voltage.
Applications
Universal Remote
Controls for Tablets
Universal Remote
Controls for
Smartphones
Block Diagram
REGULATOR
VOLTAGE
MONITOR
GPIO
2 x I2C
2x
16-BIT TIMER
MAXQ617
16-BIT MAXQ
RISC CPU
CLOCK
80KB FLASH
MEMORY
WATCHDOG
UTILITY
ROM
8kHz NANO
RING
4KB
DATA SRAM
IR DRIVER
IR RECEIVER
WITH
AMPLIFIER
IR TIMER
SPI
USART
Features
S High-Performance, Low-Power, 16-Bit RISC Core
S Internal 12MHz Oscillator Requires no External
Components
S 1.67V to 3.6V Operating Voltage
S 33 Total Instructions for Simplified Programming
S Three Independent Data Pointers Accelerate Data
Movement with Automatic Increment/Decrement
S Dedicated Pointer for Direct Read from Code Space
S 16-Bit Instruction Word, 16-Bit Data Bus
S 16 x 16-Bit General-Purpose Working Registers
S Memory Features
80KB Flash Memory
4KB Data SRAM
S Additional Peripherals
Power-Fail Warning
Power-On Reset (POR)/Brownout Reset
Automatic IR Carrier Frequency Generation
and Modulation
IR Learning Amplifier
IR Transmit Driver with 200mA (min) Sink
Current at 1.8V
Two 16-Bit Programmable Timers/Counters
with Prescaler and Capture/Compare
One SPI, Two I2C, and One USART Port
Programmable Watchdog Timer
8kHz Nanopower Ring Oscillator Wake-Up Timer
Up to 10 General-Purpose I/Os
S Low Power Consumption
0.2µA (typ), 2.0µA (max) in Stop Mode,
TA = +25NC, Power-Fail Monitor Disabled
2.0mA (typ) at 12MHz in Active Mode
Ordering Information appears at end of data sheet.
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6877; Rev 0; 12/13
1 page  
MAXQ617
Infrared Remote Control System-on-Chip
ELECTRICAL CHARACTERISTICS (continued)
(Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the operating temperature range and relevant supply voltage range
are guaranteed by design and characterization. Specifications marked GBD are guaranteed by design and not production tested.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Stop Mode Resume Time
Input Low Voltage for IRRX and
All Port Pins
Input High Voltage for IRRX and
All Port Pins
Input Hysteresis (Schmitt)
IRRX Input Filter Pulse-Width
Reject
tON
VIL
VIH
VIHYS
tIRRX_R
VDD = 3.3V, TA = +25NC
375 + (8192tCK)
VGND
0.3
VDD
0.7
VDD
VDD
300
50
Fs
V
V
mV
ns
IRRX Input Filter Pulse-Width
Accept
tIRRX_A
300 ns
IRTX Sink Current
Output Low Voltage for All Port
Pins
Output High Voltage All Port Pins
IIRTX
VOL
VOH
VIRTX ≥ 0.25V
VDD = 3.6V, IOL = 11mA
VDD = 2.35V, IOL = 8mA
VDD = 1.8V, IOL = 4.5mA
IOH = -2mA
200 mA
0.4 0.5
0.4 0.5
V
0.4 0.5
VDD -
0.5
VDD
V
Input/Output Pin Capacitance for
All Port Pins
CIO
15 pF
Input Leakage Current for All
Pins
IL Internal pullup disabled
-100
+100
nA
Input Pullup Resistor for RESET,
IRRX, and All Port Pins
LEARNING AMPLIFIER
IRRX Amplifier Input Low
Detection
RPU
VDD = 3.0V, VOL = 0.4V
VDD = 1.8V, VOL = 0.4V
IDL VDD = 1.8V, IRRCVEN = 1
16 28 39 kI
18 31 43 kI
0.2 FA
IRRX Amplifier Input High
Detection
CLOCK
Internal Oscillator Frequency
Internal Oscillator Variability
IDH VDD = 1.8V, IRRCVEN = 1
fOSC
fOSC_VAR
TA = -20NC to +70NC
TA = +25NC, VDD = 1.8V
TA = +15NC to +40NC, VDD = 1.8V ±5%
1.25
FA
12
±0.5%
±1%
±0.5%
MHz
MHz
Maxim Integrated
5
5 Page 
MAXQ617
Infrared Remote Control System-on-Chip
The IR timer is composed of a carrier generator and a
carrier modulator. The carrier generation module uses
the 16-bit IR carrier register (IRCA) to define the high
and low time of the carrier through the IR carrier high
byte (IRCAH) and IR carrier low byte (IRCAL). The carrier
modulator uses the IR data bit (IRDATA) and IR modula-
tor time register (IRMT) to determine whether the carrier
or the idle condition is present on IRTX.
The IR timer is enabled when the IR enable bit (IREN) is
set to 1. The IR Value register (IRV) defines the begin-
ning value for the carrier modulator. During transmission,
the IRV register is initially loaded with the IRMT value
and begins down counting towards 0000h, whereas in
receive mode it counts upward from the initial IRV regis-
ter value. During the receive operation, the IRV register
can be configured to reload with 0000h when capture
occurs on detection of selected edges or can be allowed
to continue free-running throughout the receive opera-
tion. An overflow occurs when the IR timer value rolls over
from 0FFFFh to 0000h. The IR overflow flag (IROV) is set
to 1 and an interrupt is generated if enabled (IRIE = 1).
Carrier Generation Module
The IRCAH byte defines the carrier high time in terms of
the number of IR input clocks, whereas the IRCAL byte
defines the carrier low time.
• IR Input Clock (fIRCLK) = fSYS/2IRDIV[2:0]
• Carrier Frequency (fCARRIER) = fIRCLK/(IRCAH + IRCAL + 2)
• Carrier High Time = IRCAH + 1
• Carrier Low Time = IRCAL + 1
• Carrier Duty Cycle = (IRCAH + 1)/(IRCAH + IRCAL + 2)
During transmission, the IRCA register is latched for each
IRV down-count interval, and is sampled along with the
IRTXPOL and IRDATA bits at the beginning of each new
IRV down-count interval so that duty-cycle variation and
frequency shifting is possible from one interval to the
next, which is illustrated in Figure 1.
Figure 2 illustrates the basic carrier generation and its
path to the IRTX output pin. The IR transmit polarity bit
(IRTXPOL) defines the starting/idle state and the carrier
polarity of the IRTX pin when the IR timer is enabled.
IR Transmission
During IR transmission (IRMODE = 1), the carrier genera-
tor creates the appropriate carrier waveform, while the
carrier modulator performs the modulation. The carrier
modulation can be performed as a function of carrier
cycles or IRCLK cycles dependent on the setting of the
IRCFME bit. When IRCFME = 0, the IRV down counter is
clocked by the carrier frequency and thus the modulation
is a function of carrier cycles (Figure 3). When IRCFME
= 1, the IRV down counter is clocked by IRCLK, allowing
carrier modulation timing with IRCLK resolution.
The IRTXPOL bit defines the starting/idle state as well as
the carrier polarity for the IRTX pin. If IRTXPOL = 1, the
IRTX pin is set to a logic-high when the IR timer module is
enabled. If IRTXPOL = 0, the IRTX pin is set to a logic-low
when the IR timer is enabled.
A separate register bit, IR data (IRDATA), is used to determine
whether the carrier generator output is output to the IRTX pin
for the next IRMT carrier cycles. When IRDATA = 1, the car-
rier waveform (or inversion of this waveform if IRTXPOL = 1)
is output on the IRTX pin during the next IRMT cycles. When
IRDATA = 0, the idle condition, as defined by IRTXPOL, is
output on the IRTX pin during the next IRMT cycles.
The IR timer acts as a down counter in transmit mode.
An IR transmission starts when the IREN bit is set to 1
when IRMODE = 1; when the IRMODE bit is set to 1 when
IREN = 1; or when IREN and IRMODE are both set to 1 in
the same instruction. The IRMT and IRCA registers, along
with the IRDATA and IRTXPOL bits, are sampled at the
beginning of the transmit process and every time the IR
timer value reload its value. When the IRV reaches 0000h
value, on the next carrier clock, it does the following:
1) Reloads IRV with IRMT.
2) Samples IRCA, IRDATA, and IRTXPOL.
3) Generates IRTX accordingly.
4) Sets IRIF to 1.
5) Generates an interrupt to the CPU if enabled (IRIE = 1).
To terminate the current transmission, the user can
switch to receive mode (IRMODE = 0) or clear IREN to 0.
Carrier Modulation Time = IRMT + 1 carrier cycles
Maxim Integrated
11
11 Page | ||
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| PDF Descargar | [ Datasheet MAXQ617.PDF ] | |
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