MAX6952EPL 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6952EPL

4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver

Maxim Integrated 

4-Wire Interfaced, 2.7V to 5.5V,

4-Digit 5 ✕ 7 Matrix LED Display Driver

PIN

SSOP

PDIP

1, 2, 3, 6–14, 23, 24

1, 2, 3, 7–15, 26, 27

4, 5, 16

4, 5, 6, 18

15

17

17

19

18

20

19

21

20

21

22

25–31, 34, 35, 36

32, 33

22

23

24

28–34, 38, 39, 40

35, 36, 37

Pin Description

NAME

FUNCTION

O0 to O13

GND

ISET

BLINK

DIN

CLK

DOUT

CS

OSC

O14 to O23

V+

LED Cathode Drivers. O0 to O13 outputs sink current from

the display’s cathode rows.

Ground

Segment Current Setting. Connect ISET to GND through

series resistor RSET to set the peak current.

Blink Clock Output. Output is open drain.

Serial Data Input. Data is loaded into the internal 16-bit shift

register on the rising edge of the CLK.

Serial-Clock Input. On the rising edge of CLK, data is

shifted into the internal shift register. On the falling edge of

CLK, data is clocked out of DOUT. CLK input is active only

while CS is low.

Serial Data Output. Data clocked into DIN is output to

DOUT 15.5 clock cycles later. Data is clocked out on the

rising edge of CLK. Output is push-pull.

Chip-Select Input. Serial data is loaded into the shift register

while CS is low. The last 16 bits of serial data are latched on

CS’s rising edge.

Multiplex Clock Input. To use the internal oscillator, connect

capacitor CSET from OSC to GND. To use the external

clock, drive OSC with a 1MHz to 8MHz CMOS clock.

LED Anode Drivers. O14 to O23 outputs source current to

the display’s anode columns.

Positive Supply Voltage. Bypass V+ to GND with a 47µF

bulk capacitor and a 0.1µF ceramic capacitor.

Detailed Description

The MAX6952 is a serially interfaced display driver that

can drive four digits of 5 ✕ 7 cathode-row dot-matrix

displays. The MAX6952 can drive either four monocolor

digits (Table 1) or two bicolor digits (Table 2). The

MAX6952 includes a 128-character font map compris-

ing 104 predefined characters and 24 user-definable

characters. The predefined characters follow the Arial

font, with the addition of the following common sym-

bols: £, €, ¥, °, µ, ±, ↑, and ↓. The 24 user-definable

characters are uploaded by the user into on-chip RAM

through the serial interface and are lost when the

device is powered down. Figure 1 is the MAX6952

functional diagram.

Serial Interface

The MAX6952 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

clock data into or out of the device, and DIN must be

stable when sampled on the rising edge of CLK. DOUT

is stable on the rising edge of CLK. Note that while the

SPI protocol expects DOUT to be high impedance

when the MAX6952 is not being accessed, DOUT on

the MAX6952 is never high impedance.

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