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PDF AS1117 Data sheet ( Hoja de datos )
| Número de pieza | AS1117 | |
| Descripción | 64 LED Driver | |
| Fabricantes | austriamicrosystems | |
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Datasheet
AS1117
64 LED Driver for Mobile Applications with Error Detection
1 General Description
The AS1117 is a compact LED driver for 64 single LEDs
or 8 digits of 7-segments. The devices can be pro-
grammed via an I²C compatible 2-wire interface. Every
segment can be individually addressed and updated
separately. Only one external resistor (RSET) is required
to set the current. LED brightness can be controlled by
analog or digital means.
The devices include an integrated BCD code-B/HEX
decoder, multiplex scan circuitry, segment and display
drivers, and a 64-bit memory. Internal memory stores
the shift register settings, eliminating the need for contin-
uous device reprogramming.
Table 1. Available Products
Devices
RESET Input Interfaces
AS1115 no I²C
AS1116
no SPI
AS1117 yes I²C
AS1118
yes SPI
Additionally the AS1117 offers a detailed error diagnostic
mode for easy and fast production testing in critical
applications. The AS1117 features a low shutdown cur-
rent of typically 200nA, and an operational current of
typically 350µA. The number of digits can be pro-
grammed, the devices can be reset by software, and an
external clock is also supported.
The device is available in a TQFN(4x4)-24 package.
2 Key Features
! 3.4MHz I²C-Compatible Interface
! Individual LED Segment Control
! Readback for 8 Keys plus Interrupt
! Open and Shorted LED Error Detection
- Global or Individual Error Detection
! Hexadecimal- or BCD-Code for 7-Segment Displays
! 200nA Low-Power Shutdown Current (typ; data
retained)
! Digital and Analog Brightness Control
! Display Blanked on Power-Up
! Drive Common-Cathode LED Displays
! Supply Voltage Range: 2.7V to 5.5V
! Software and Hardware Reset
! Up to 4 devices cascadable
! Optional External Clock
! Package: TQFN(4x4)-24
3 Applications
The AS1117 is ideal for seven-segment or dot matrix
user interface displays of mobile applications, set-top
boxes, VCRs, DVD-players, washing machines, micro
wave ovens, refrigerators and other white good or per-
sonal electronic applications.
Figure 1. AS1117 - Typical Application Diagram
VDD
2.7V to 5.5V
9.53kΩ
VDD
ISET
SDA
SCL
µP IRQ
SDA
SCL
IRQ
RESETN
AS1117
DIG0 to
DIG7
SEGA-DP
KEY0-7
KEY
8
8
GND
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
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1 page  
AS1117
Datasheet - Electrical Characteristics
Table 6. Timing Characteristics
Symbol
Parameter
fSCL SCL Frequency
Bus Free Time Between STOP and
tBUF START Conditions
Hold Time for Repeated
tHOLDSTART START Condition
tLOW SCL Low Period
tHIGH SCL High Period
tSETUPSTART
Setup Time for Repeated
START Condition
tSETUPDATA Data Setup Time
tHOLDDATA Data Hold Time
tRISE(SCL) SCL Rise Time
SCL Rise Time after Repeated START
tRISE(SCL1) Condition and After an ACK Bit
tFALL(SCL) SCL Fall Time
tRISE(SDA) SDA Rise Time
tFALL(SDA) SDA Fall Time
tSETUPSTOP STOP Condition Setup Time
tSPIKESUP Pulse Width of Spike Suppressed
Key Readback
Debounce Time
Conditions
Min Typ Max Unit
0.1 3.4 MHz
1.3 µs
160 ns
50 75 ns
50 75 ns
100 ns
10 ns
70 ns
10 40 ns
10 80 ns
10 40 ns
20 80 ns
20 80 ns
160 ns
50 ns
20 ms
Notes:
1. The Min / Max values of the Timing Characteristics are guaranteed by design.
2. All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC
(Statistical Quality Control) methods.
Figure 3. Timing Diagram
SDI
SCL
tBUF
tHOLDSTART
tR
tLOW
tSETUPDATA
tF
tHIGH
tHOLDSTART
tSPIKESUP
tSETUPSTART
tSETUPSTOP
STOP START
tHOLDDATA
Repeated
START
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
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5 Page 
AS1117
Datasheet - Detailed Description
Command Byte
The AS1117 operation, (see Table 7) is determined by a command byte (see Figure 21 on page 11).
Figure 21. Command Byte
MSB
6
5
4
3
2
1 LSB
D15 D14 D13 D12 D11 D10 D09 D08
Figure 22. Command and Single Data Byte Received
From Master to Slave
From Slave to Master
AS1117 Registers
0 D15 D14 D13 D12 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
S
Slave Address
R/W A
Command Byte
A
Acknowledge
from AS1117 0
Acknowledge
from AS1117 0
Data Byte
AP
1 Byte
Acknowledge
from AS1117
0
Autoincrement
Memory Word
Address
Figure 23. Setting the Pointer to a Address Register to select a Data Register for a Read Operation
From Master to Slave
From Slave to Master
AS1117 Registers
0 D15 D14 D13 D12 D11 D10 D9 D8
S
Slave Address
R/W A
Command Byte
AP
Acknowledge
from AS1117 0
Acknowledge
from AS1117 0
Figure 24. Reading nBytes from AS1117
From Master to Slave
From Slave to Master Acknowledge
from AS1117 0
S
Slave Address
R/W A
Autoincrement
Memory Word
Address
Acknowledge
from Master 0
First Data Byte
A
Stop reading
Not Acknowledge
from Master
1
n Bytes
Second Data Byte
/A P
1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
AS1117 Registers
Autoincrement
to next address
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
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