MAX6952EAX+ Datasheet

IC型号：
MAX6952EAX+
PDF描述：
IC DRVR DSPL LED 36-SSOP
文件大小：
395.90KB
PDF页数：
21页
芯片厂家：
Maxim

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4-Wire Interfaced, 2.7V to 5.5V,

4-Digit 5

鉁?/div>

7 Matrix LED Display Driver

MAX6952

Table 15. Memory Mapping of User-Defined Font Register 0x05

ADDRESS CODE

(HEX)

0x85

DATA

0x00鈥?x7F

SPI READ

OR WRITE

Read

FUNCTION

Read 7-bit user-definable font data entry from current font

address. MSB of the register data is clear. Font address

pointer is incremented after the read.

Write 7-bit user-definable font data entry to current font

address. Font address pointer is incremented after the

write.

Write font address pointer with the register data.

0x05

0x00鈥?x7F

0x80鈥?xFF

Write

Table 16. Font Pointer Address Behavior

FONT POINTER ADDRESS

0x80 to 0xF6

0xF7

0xF8 to 0xFF

ACTION

Valid range to set the font address pointer. Pointer autoincrements after a font data read or

write, while pointer address remains in this range.

Font address resets to 0x80 after a font data read or write to this pointer address.

Invalid range to set the font address pointer. Pointer is set to 0x80 if address.

鈥?If OSC is driven with an accurate frequency, blink

can be used as a seconds counter or similar.

No-Op Register

A write to the no-op register is ignored.

Scan-Limit Register

The scan-limit register sets how many monocolor digits

are displayed, either two or four. A bicolor digit is con-

nected as two monocolor digits.

The multiplexing scheme drives digits 0 and 1 at the

same time, then digits 2 and 3 at the same time. To

increase the effective brightness of the displays, drive

only two digits instead of four. By doing this, the aver-

age segment current doubles, but also doubles the

number of MAX6952s required to drive a given number

of digits.

Because digit 1 is driven at the same time as digit 0

(and digit 3 is driven at the same time as digit 2), only 1

bit is used to set the scan limit. The bit is clear if one or

two digits are to be driven, and set if three or four digits

are to be driven (Table 20). Change the scan-limit

Selecting External Components R

SET

and

SET

to Set Oscillator Frequency and

Segment Current

The RC oscillator uses an external resistor RSET and an

external capacitor C

SET

to set the oscillator frequency,

OSC

. The allowed range of f

OSC

is 1MHz to 8MHz.

SET

also sets the peak segment current. The recom-

mended values of R

SET

and C

SET

set the oscillator to

4MHz, which makes the blink frequencies 0.5Hz and

1Hz. The recommended value of R

SET

also sets the

peak current to 40mA, which makes the segment cur-

rent adjustable from 2.5mA to 37.5mA in 2.5mA steps:

SEG

= K

/ R

SET

OSC

= K

/ (R

SET

鉁?/div>

SET

+ C

STRAY

) MHz

Where:

= 2144

= 6000

SET

= external resistor in k鈩?/div>

SET

= external capacitor in pF

STRAY

= stray capacitance from OSC pin to GND in

pF, typically 2pF

The recommended value of R

SET

is 53.6k鈩?and the

recommended value of C

SET

is 26pF.

Intensity Registers

Display brightness is controlled digitally by four pulse-

width modulators, one for each display digit. Each digit is

controlled by a nibble of one of the two intensity registers,

Intensity10 and Intensity32. The modulator scales the

average segment current in 16 steps from a maximum of

15/16 down to 1/16 of the peak current. The minimum

interdigit blanking time is, therefore, 1/16 of a cycle. The

maximum duty cycle is 15/16. (Tables 21 and 22).

______________________________________________________________________________________

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MAX6952EAX+ 产品属性

产品培训模块
Lead (SnPb) Finish for COTSObsolescence Mitigation Program
标准包装
30
类别
集成电路 (IC)
家庭
PMIC - 显示器驱动器
系列
-
显示器类型
LED
配置
5 x 7（矩阵）
接口
4 线串行
数字或字符
4 位数字
电流 - 电源
12mA
电源电压
2.7 V ~ 5.5 V
工作温度
-40°C ~ 85°C
安装类型
表面贴装
封装/外壳
36-BSOP（0.295"，7.50mm 宽）
供应商设备封装
36-SSOP
包装
管件

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