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MAX6954ATL の電気的特性と機能

MAX6954ATLのメーカーはMaxim Integratedです、この部品の機能は「2.7V to 5.5V LED Display Driver」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX6954ATL
部品説明 2.7V to 5.5V LED Display Driver
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX6954ATL Datasheet, MAX6954ATL PDF,ピン配置, 機能
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
General Description
The MAX6954 is a compact display driver that inter-
faces microprocessors to a mix of 7-segment, 14-seg-
ment, and 16-segment LED displays through an SPI-/
QSPI™-compatible 4-wire serial interface. The serial
interface may be cascaded through multiple devices.
The MAX6954 drives up to 16 digits 7-segment, 8 dig-
its 14-segment, 8 digits 16-segment, or 128 discrete
LEDs, while functioning from a supply voltage as low as
2.7V. The driver includes five I/O expander (or GPIO)
lines, some or all of which may be configured as
a key-switch reader, which automatically scans and
debounces a matrix of up to 32 switches.
Included on chip are full 14- and 16-segment ASCII
104-character fonts, a hexadecimal font for 7-segment
displays, multiplex scan circuitry, anode and cathode driv-
ers, and static RAM that stores each digit. The maximum
segment current for the display digits is set using a single
external resistor. Digit intensity can be independently
adjusted using the 16-step internal digital brightness con-
trol. The MAX6954 includes a low-power shutdown mode,
a scan-limit register that allows the user to display from 1
to 16 digits, segment blinking (synchronized across mul-
tiple drivers, if desired), and a test mode, which forces all
LEDs on. The LED drivers are slew-rate limited to reduce
EMI.
For a 2-wire interfaced version, refer to the MAX6955
data sheet. An evaluation kit (EV kit) for the MAX6955 is
available.
Applications
● Set-Top Boxes
● Panel Meters
● White Goods
● Bar Graph Displays
● Audio/Video Equipment
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX6954AAX
-40°C to +125°C
36 SSOP
MAX6954APL
-40°C to +125°C
40 PDIP
MAX6954ATL+
-40°C to +125°C
40 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
Features
● High-Speed 26MHz SPI/QSPI/MICROWIRE®-
Compatible Serial Interface
● 2.7V to 5.5V Operation
● Drives Up to 16 Digits 7-Segment, 8 Digits
14-Segment, 8 Digits 16-Segment, 128 Discrete
LEDs, or a Combination of Digit Types
● Drives Common-Cathode Monocolor and Bicolor LED
Displays
● Built-In ASCII 104-Character Font for 14-Segment
and 16-Segment Digits and Hexadecimal Font for
7-Segment Digits
● Automatic Blinking Control for each Segment
● 10µA (typ) Low-Power Shutdown (Data Retained)
● 16-Step Digit-by-Digit Digital Brightness Control
● Display Blanked on Power-Up
● Slew-Rate Limited Segment Drivers for Lower EMI
● Five GPIO Port Pins Can Be Configured as Key-
Switch Reader to Scan and Debounce Up to 32
Switches with n-Key Rollover
● IRQ Output when a Key Input Is Debounced
● 36-Pin SSOP and 40-Pin DIP and TQFN Packages
● Automotive Temperature Range Standard
Functional Diagram
ISET
CURRENT
SOURCE
OSC
OSC_OUT
DIVIDER/
COUNTER
NETWORK
GPIO
AND KEY-SCAN
CONTROL
PWM
BRIGHTNESS
CONTROL
DIGIT
MULTIPLEXER
P0 TO P4
LED
DRIVERS
O0 TO O23
MAX6954
CHARACTER
GENERATOR
ROM
BLINK
BLINK
CONTROL
CONFIGURATION
RAM REGISTER
CLK
CS
DIN
DOUT
4-WIRE SERIAL INTERFACE
Pin Configurations and Typical Operating Circuits appear
at end of data sheet.
19-2460; Rev 5; 7/14

1 Page





MAX6954ATL pdf, ピン配列
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
DC Electrical Characteristics (continued)
(Typical Operating Circuits, V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
Segment Drive Source Current
Segment Current Slew Rate
Segment Drive Current Matching
LOGIC INPUTS AND OUTPUTS
Input Leakage Current
DIN, CLK, CS, OSC, P0, P1, P2,
P3, P4
SYMBOL
ISEG
DISEG/Dt
DISEG
CONDITIONS
VLED = 2.2V,
V+ = 3.3V
TA = +25°C
TA = +25°C, V+ = 3.3V
TA = +25°C, V+ = 3.3V
IIH, IIL
MIN
-34.5
TYP
-40
11
5
MAX UNITS
-46.5 mA
mA/µs
10 %
-1 +1 µA
4-Wire Logic-High Input Voltage
DIN, CLK, CS
4-Wire Logic-Low Input Voltage
DIN, CLK, CS
Port Logic-High Input Voltage
P0, P1, P2, P3, P4
Port Logic-Low Input Voltage
P0, P1, P2, P3, P4
Port Hysteresis Voltage P0, P1,
P2, P3, P4
Port Input Pullup Current from V+
Port Output Low Voltage
Blink Output Low Voltage
DOUT Output High Voltage
DOUT Output Low Voltage
OSC_OUT Output High Voltage
OSC_OUT Output Low Voltage
VIHSPI
VILSPI
VIHP
VILP
DVIP
IIPU
VOLP
VOLBK
VOHDO
VOLDO
VOHOSC
VOLOSC
P0 to P3 configured as keyscan input,
V+ = 3.3V
ISINK = 8mA
ISINK = 0.6mA
ISOURCE = 1.6mA
ISINK = 1.6mA
ISOURCE = 1.6mA
ISINK = 1.6mA
1.8 V
0.6
0.7 x
V+
0.03 x
V+
0.3 x
V+
75
0.3
0.1
V+ -
0.2
V+ -
0.4
0.5
0.3
0.2
0.4
V
V
V
V
µA
V
V
V
V
V
V
www.maximintegrated.com
Maxim Integrated 3


3Pages


MAX6954ATL 電子部品, 半導体
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Pin Description
SSOP
PIN
PDIP
TQFN-EP
1, 2,
34, 35,
36
1, 2, 36, 37,
38, 39, 40 33, 34, 35
NAME
P0–P4
FUNCTION
General-Purpose I/O Ports (GPIOs). GPIO can be configured as logic inputs or
open-drain outputs. Enabling key scanning configures some or all ports P0–P3 as
key-switch matrix inputs with internal pullup and port P4 as IRQ output.
3
4
5
6
7–15,
22–31
16, 18
17
19, 21
20
32
33
3
38
CS
Chip-Select Input. Serial data is loaded into the shift register while CS is low. The
most recent 16 bits of data latch on CS’s rising edge.
4
39
DOUT
Serial-Data Output. The data into DIN is valid at DOUT 15.5 clock cycles later. Use
this pin to daisy-chain several devices or allow data readback. Output is push-pull.
5
40
CLK
Serial-Clock Input. On CLK’s rising edge, data shifts into the internal shift register. On
CLK’s falling edge, data is clocked out of DOUT. CLK is active only while CS is low.
6
1
DIN
Serial-Data Input. Data from DIN loads into the internal 16-bit shift register on
CLK’s rising edge.
7–15,
26–35
2–10,
21–30
O0–O18
Digit/Segment Drivers. When acting as digit drivers, outputs O0 to O7 sink current
from the display common cathodes. When acting as segment drivers, O0 to O18
source current to the display anodes. O0 to O18 are high impedance when not
being used as digit or segment drivers.
17, 18, 20 12, 13, 15 GND Ground
19
14
ISET
Segment Current Setting. Connect ISET to GND through series resistor RSET to set
the peak current.
21, 23, 24 16, 18, 19
V+
Positive Supply Voltage. Bypass V+ to GND with a 47µF bulk capacitor and a 0.1µF
ceramic capacitor.
22
17
OSC
Multiplex Clock Input. To use internal oscillator, connect capacitor CSET from OSC
to GND. To use external clock, drive OSC with a 1MHz to 8MHz CMOS clock.
36 31 BLINK Blink Clock Output. Output is open drain.
37
32
OSC_OUT
Clock Output. OSC_OUT is a buffered clock output to allow easy blink
synchronization of multiple MAX6954s. Output is push-pull.
16, 25
11, 20
N.C. Not Connected Internally
EP
Exposed Pad (TQFN package only). Internally connected to GND. Connect to a
large ground plane to maximize thermal performance.
Detailed Description
The MAX6954 is a serially interfaced display driver that
can drive up to 16 digits 7-segment, 8 digits 14-segment,
8 digits 16-segment, 128 discrete LEDs, or a combination
of these display types. Table 1 shows the drive capability
of the MAX6954 for monocolor and bicolor displays.
The MAX6954 includes 104-character ASCII font maps
for 14-segment and 16-segment displays, as well as
the hexadecimal font map for 7-segment displays. The
characters follow the standard ASCII font, with the addi-
tion of the following common symbols: £, €, ¥, °, µ, ±,
↑, and ↓. Seven bits represent the 104-character font
map; an 8th bit is used to select whether the decimal
point (DP) is lit. Seven-segment LED digits may be con-
trolled directly or use the hexadecimal font. Direct seg-
ment control allows the MAX6954 to be used to drive
bar graphs and discrete LED indicators.
Tables 2, 3, and 4 list the connection schemes for 16-,
14-, and 7-segment digits, respectively. The letters in
Tables 2, 3, and 4 correspond to the segment labels
shown in Figure 1. (For applications that require mixed
display types, see Tables 37–40.)
Serial Interface
The MAX6954 communicates through an SPI-compati-
ble 4-wire serial interface. The interface has three
inputs: clock (CLK), chip select (CS), and data in (DIN),
and one output, data out (DOUT). CS must be low to
www.maximintegrated.com
Maxim Integrated 6

6 Page



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部品番号部品説明メーカ
MAX6954ATL

2.7V to 5.5V LED Display Driver

Maxim Integrated
Maxim Integrated


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