Philips Semiconductors
Product specification
4-digit LED-driver with I
2
C-Bus interface
GENERAL DESCRIPTION
The LED-driver is a bipolar integrated circuit made in an
I
2
L compatible 18 volts process. The circuit is especially
designed to drive four 7-segment LED displays with
decimal point by means of multiplexing between two pairs
of digits. It features an I
2
C-Bus slave transceiver interface
with the possibility to program four different SLAVE
ADDRESSES, a POWER RESET flag, 16 current sink
OUTPUTS, controllable by software up to 21 mA, two
multiplex drive outputs for common anode segments, an
on-chip multiplex oscillator, control bits to select static,
dynamic and blank mode, and one bit for segment test.
QUICK REFERENCE DATA
PARAMETER
Supply voltage
Supply current all outputs OFF
Total power dissipation
24-lead DIL (SOT101B)
24-lead DIL SO (SOT137A)
Operating ambient
temperature range
Note
1. The positive current is defined as the conventional current flow into a device (sink current).
PACKAGE OUTLINE
SAA1064: 24-lead DIL; plastic with internal heat spreader (SOT101B); SOT101-1; 1996 August 30.
SAA1064T: 24-lead mini-pack; plastic (SO-24; SOT137A); SOT137-1; 1996 August 30.
T
amb
−40
−
P
tot
P
tot
−
−
−
−
CONDITIONS
V
EE
= 0 V
V
CC
= 5 V
SYMBOL
V
CC
I
CC(1)
7
MIN.
4.5
5
9.5
TYP.
SAA1064
MAX.
15
14
1000
500
+85
V
UNIT
mA
mW
mW
°C
February 1991
2
Philips Semiconductors
Product specification
4-digit LED-driver with I
2
C-Bus interface
FUNCTIONAL DESCRIPTION
SAA1064
a. READ mode.
b. WRITE mode.
S = start condition
P = stop condition
A = acknowledge
X = don’t care
A1, A0
SC SB SA
C6 to C0
PR
Fig.3 I
2
C-Bus format.
= programmable address bits
= subaddress bits
= control bits
= POWER RESET flag
Address pin ADR
Four different slave addresses can be chosen by connecting ADR either to V
EE,
3/8 V
CC
, 5/8 V
CC
or V
CC
. This results in
the corresponding valid addresses HEX 70, 72, 74 and 76 for writing and 71, 73, 75 and 77 for reading. All other
addresses cannot be acknowledged by the circuit.
February 1991
5
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