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参数资料
| 型号： | AS1117-BQFT |
| 厂商： | ams |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER 64LED MOBILE 24-TQFN |
| 标准包装： | 1 |
| 系列： | * |
AS1117
Datasheet - D e t a i l e d D e s c r i p t i o n
Initial Power-Up
On initial power-up, the AS1117 registers are reset to their default values, the display is blanked, and the device goes
into shutdown mode. At this time, all registers should be programmed for normal operation.
Note: The default settings enable only scanning of one digit; the internal decoder is disabled and the Intensity Control
Register ( see page 17 ) is set to the minimum values.
Shutdown Mode
The AS1117 devices feature a shutdown mode, where they consume only 200nA (typ) current. Shutdown mode is
entered via a write to the Shutdown Register (see Table 8 ) or via pulling the pin RESTEN to logic low. When pin
RESETN is set to logic low an according write to the Shutdown Register is done internally. During shutdown mode the
Digit-Registers maintain their data.
Note: When pin RESETN is pulled to logic high again, a write to the Shutdown Register in necessary to leave the
shutdown mode.
Shutdown mode can either be used as a means to reduce power consumption or for generating a flashing display
(repeatedly entering and leaving shutdown mode). For minimum supply current in shutdown mode, logic input should
be at GND or V DD (CMOS logic level).
When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown
Register bit D7 (page 13) = 0.
Note: When Shutdown Register bit D7 = 1, the Feature Register is left unchanged when entering or leaving shut-
down mode. If the AS1117 is used with an external clock, Shutdown Register bit D7 should be set to 1 when
writing to the Shutdown Register.
Digit- and Control-Registers
The AS1117 devices contain 8 Digit-Registers,11 control-registers and 10 diagnostic-registers, which are listed in Table
7 . All registers are selected using a 8-bit address word, and communication is done via the I2C interface.
!
!
Digit Registers – These registers are realized with an on-chip 64-bit memory. Each digit can be controlled directly
without rewriting the whole register contents.
Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shut-
down, display test and features selection registers.
Table 7. Register Address Map
Register
Digit 0
Digit 1
Digit 2
Digit 3
Digit 4
Digit 5
Digit 6
Digit 7
D15:D13
000
000
000
000
000
000
000
000
D12
0
0
0
0
0
0
0
0
D11
0
0
0
0
0
0
0
1
D10
0
0
0
1
1
1
1
0
Address
D9
0
1
1
0
0
1
1
0
D8
1
0
1
0
1
0
1
0
D7:D0
(see Table 10 on page 14 ,
Table 11 on page 14 and
Table 12 on page 15 )
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www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
12 - 23
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