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参数资料
| 型号： | MAX6850AEE-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 显示驱动器 |
| 英文描述： | 4-Wire Interfaced, 7-, 14-, and 16-Segment Alphanumeric Vacuum-Fluorescent Display Controller |
| 中文描述： | VACUUM FLUOR DISPLAY DRIVER, PDSO16 |
| 封装： | 0.150 INCH, 0.25 MM PITCH, MO-137, QSOP-16 |
| 文件页数： | 18/34页 |
| 文件大小： | 485K |
| 代理商： | MAX6850AEE-T |
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annunciators on and sets the duty cycle to 7/16 (half-
power) (Table 29).
Reading the display-test and device ID register returns
the MAX6850 device ID 0b0000 010 that identifies the
driver type, plus the display-test status in the LSB.
Output Shift-Limit Register
The output serial interface is used to transfer display
data from the MAX6850 to the display driver. The serial
interface bit-stream output length is programmable up
to 84 bits, which are labeled DD0–DD83. Set the num-
ber of bits with the shift-limit register, address 0x0E. If
the shift-limit register is written with an out-of-range
value 0x54 to 0xFF, then the value 0x53 is stored
instead. Table 30 shows the shift-limit register.
Output Map
The output map comprises 84 words of 7-bit RAM. The
output map data should be written when the MAX6850
is configured after power-up. Table 31 shows the out-
put map RAM codes.
The output map is an indirect addressing reference
table. It translates bit position in the output shift register
(valid range: from zero to the value in shift-limit register
0E, which has a maximum of 83) to bit function. Any
output shift-register bit position may be set to any grid
character segment, DP segment, annunciator segment,
or cursor segment.
The power-up default pattern for output map RAM
maps a 40-digit, two-digits-per-grid display with DPs
and cursors (Table 32).
If the user selects an unused map RAM entry (88–127)
for an output shift-register position, then the correspond-
ing output bit is always low (segment or grid OFF).
When selecting an invalid map RAM entry (for example,
codes 48 to 83 to select annunciators in 96/2 mode,
which does not support annunciators), the correspond-
ing output bit is always low (segment or grid OFF).
If the map RAM entry corresponds to a nonexistent font
segment (no action in Table 32) when the digit data is
processed through the character font, then the result
again is zero (segment or grid OFF).
The output map data is indirectly accessed by an
autoincrementing output map address pointer in the
MAX6850 at address 0x06. The output map address
pointer can be written (i.e., set to an address between
0x00 and 0x53) but cannot be read back. The output
map data is written and read back through the output
map address pointer.
MAX6850
4-Wire Interfaced, 7-, 14-, and 16-Segment Alpha-
numeric Vacuum-Fluorescent Display Controller
______________________________________________________________________________________
25
REGISTER DATA
GRIDS
COMMAND
ADDRESS
D7
D6
D5
D4
D3
D2
D1
D0
HEX
CODE
VFBLANK is high to disable the display.
0x01
X
0
0xX0
VFBLANK is low to disable the display.
0x01
X
1
0
0xX2
Table 28. VFBLANK Polarity Register Format
REGISTER DATA
MODE
COMMAND
ADDRESS
D7
D6
D5
D4
D3
D2
D1
D0
Normal operation
0x07
X
XXXX
0
Display test
0x07
X
XXXX
1
Read MAX6850 device ID and display test status
0x87
0
0010
DT
Table 29. Display-Test and Device ID Register Format
REGISTER DATA
SHIFT LIMIT
COMMAND
ADDRESS
D7
D6
D5
D4
D3
D2
D1
D0
HEX CODE
Minimum setting example (01)
0x0E
000000
01
0x01
Maximum setting example (83 or 0x53)
0x0E
010100
11
0x53
Table 30. Shift-Limit Register Format
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