AS1116
Datasheet - D e t a i l e d D e s c r i p t i o n
Serial-Addressing Format
The AS1116 contains a 16bit SPI interface to access the internal data and control registers of the device
The SPI interface is driven with the rising edge of SCL. A falling edge on LD signal
indicates the beginning of an access on the SPI interface, the rising edge on LD determines an access on SPI. An
access must consist of exactly 16bits for write operation and 8bits for read operation. Timing restrictions on the SPI
interface pins are defined in
shows the structure of the 16bit command word for writing data,
the 8bit command word for read oper-
ation.
D0 (write operation) / D8 (read operation) is the first bit to shift into the SPI interface after the falling edge of LD, is the
last bit to write to SPI before rising edge of LD.
At a read operation an 8bit operation is executed. At the first rising edge of SCL after the rising edge of LD D7 of
addressed register is written to SDO pin. At the next rising edge of SCL D6 is written to SDO pin. LD must be kept high
during reading data from a internal data or control register of AS1116.
Table 6. 16-Bit Serial Data Format
D0
LSB
D1
D2
D3
D4
Data
D5
D6
D7
MSB
D8
D9
D10
D11
D12
Register Address (see
D13
0
D14
R/W
D15
X
Figure 17. Read operation
1
8
9
10
16
SCL
LD
SDO
D7
D4
D3
D2
D1
D0
D6
D5
Figure 18. Interface Timing
LD
t
CSW
t
CSS
t
CP
t
CL
t
CH
t
CSH
t
LDCK
SCL
t
DS
t
DH
SDI
D0
D1
D14
D15
t
DO
SDO
Initial Power-Up
On initial power-up, the AS1116 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
is set to the minimum values.
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