AS1118 Datasheet, PDF (10/21 Pages) ams AG – 64 LED Dr iver for Mobi le Appl ications wi th Er ror Detect ion

AS1118
Datasheet - Detailed Description
Shutdown Mode
The AS1118 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 9) 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.
For the AS1118, at that point, all segment current sources and digital drivers are switched off, so that all segments are
blanked. 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.
lid ^{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 VDD (CMOS logic level).
a _{When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown}
v _{Register bit D7 (page 10) = 0.}
ill ^{Note: When Shutdown Register bit D7 = 1, the Feature Register is left unchanged when entering or leaving shut-}
down mode. If the AS1118 is used with an external clock, Shutdown Register bit D7 should be set to 1 when
writing to the Shutdown Register.
t _{Digit- and Control-Registers}
G _{s The AS1118 devices contain 8 Digit-Registers,11 control-registers and 8 diagnostic-registers, which are listed in Table}
8. All registers are selected using a 8-bit address word, and communication is done via the serial interface.
A ^t _{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.
s ^{n Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shut-}
e ^{down, display test and features selection registers.}
m ^{t Table 8. Register Address Map}
a ^{n Register}
Address
D15 D14 D13 D12 D11 D10 D9 D8
o _No-Op
Digit 0
c _{Digit 1}
l _{Digit 2}
Digit 3
a _{Digit 4}
ic ^{Digit 5}
Digit 6
Digit 7
X 0000000
X 0000001
X 0000010
X 0000011
X 0000100
X 0000101
X 0000110
X 0000111
X 0001000
n _Decode-Mode
h ^{Global Intensity}
Scan Limit
c_Shutdown
e^{Not Used}
T^Feature
X 0001001
X 0001010
X 0001011
X 0001100
X 0001101
X 0/1 0 0 1 1 1 0
D7:D0
(see Table 11 on page 11,
Table 12 on page 11 and
Table 13 on page 11)
(see Table 10 on page 10)
(see Table 17 on page 13)
(see Table 19 on page 13)
(see Table 9 on page 10)
(see Table 20 on page 14)
Page
14
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
10
13
13
9
N/A
14
Display Test Mode X 0 0 0 1 1 1 1 (see Table 14 on page 12) 10
DIG0:DIG1 Intensity X 0 0 1 0 0 0 0 (see Table 18 on page 13)
DIG2:DIG3 Intensity X 0 0 1 0 0 0 1 (see Table 18 on page 13)
DIG4:DIG5 Intensity X 0 0 1 0 0 1 0 (see Table 18 on page 13)
DIG6:DIG7 Intensity X 0 0 1 0 0 1 1 (see Table 18 on page 13)
www.austriamicrosystems.com/LED-Driver-ICs/AS1118
Revision 1.01
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