MAX6952 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX6952 Datasheet PDF : 21 Pages
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4-Wire Interfaced, 2.7V to 5.5V,
4-Digit 5 ✕ 7 Matrix LED Display Driver
Table 1. Connection Scheme for Four Monocolor Digits
DIGIT O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 O10 O11 O12 O13 O14 O15 O16 O17 O18 O19 O20 O21 O22 O23
1
Digit 0 rows (cathodes) R1 to R7
—
Digit 1 rows (cathodes) R1 to R7
Digit 0 columns (anodes)
C1 to C5
Digit 1 columns
(anodes) C6 to C10
2
—
Digit 2 rows (cathodes) R1 to R7 Digit 2 columns (anodes)
Digit 3 columns
Digit 3 rows (cathodes) R1 to R7
C1 to C5
(anodes) C6 to C10
Table 2. Connection Scheme for Two Bicolor Digits
DIGIT O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 O10 O11 O12 O13 O14 O15 O16 O17 O18 O19 O20 O21 O22 O23
1 Digit 0 rows (cathodes) R1 to R14
—
Digit 0 columns (anodes) C1 to C10
- the 5 green anodes -
- the 5 red anodes -
Digit 1 columns (anodes) C1 to C10
2
—
Digit 1 rows (cathodes) R1 to R14 - the 5 green anodes -
- the 5 red anodes -
Table 3. Serial-Data Format (16 Bits)
D15 D14 D13 D12 D11 D10 D9
R/W ADDRESS
D8 D7 D6
MSB
D5 D4 D3
DATA
D2 D1
D0
LSB
ISET
CURRENT
SOURCE
OSC
DIVIDER/
COUNTER
NETWORK
PWM
BRIGHTNESS
CONTROL
ROW
MULTIPLEXER
LED
DRIVERS
CHARACTER
GENERATOR
RAM
CHARACTER
GENERATOR
ROM
BLINK
BLINK
SPEED
SELECT
RAM
CONFIGURATION
REGISTERS
O0 TO O23
CLK
CS
DIN
DOUT
MAX6952
SERIAL INTERFACE
Figure 1. Functional Diagram
CLK and DIN may be used to transmit data to other
peripherals. The MAX6952 ignores all activity on CLK
and DIN except when CS is low.
Control and Operation Using the 4-Wire Interface
Controlling the MAX6952 requires sending a 16-bit
word. The first byte, D15 through D8, is the command
byte (Table 3), and the second byte, D7 through D0, is
the data byte.
Connecting Multiple MAX6952s to the 4-Wire Bus
Multiple MAX6952s may be daisy-chained by connect-
ing the DOUT of one device to the DIN of the next, and
driving CLK and CS lines in parallel (Figure 6). Data at
DIN propagates through the internal shift registers and
appears at DOUT 15.5 clock cycles later, clocked out
on the falling edge of CLK. When sending commands
to daisy-chained MAX6952s, all devices are accessed
at the same time. An access requires (16 x n) clock
cycles, where n is the number of MAX6952s connected
together. To update just one device in a daisy-chain,
the user can send the no-op command (0x00) to the
others.
Writing Device Registers
The MAX6952 contains a 16-bit shift register into which
DIN data are clocked on the rising edge of SCLK, when
CS is low. When CS is high, transitions on SCLK have
no effect. When CS goes high, the 16 bits in the shift
6 _______________________________________________________________________________________
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