MAX6958AAEE Maxim Integrated Products, MAX6958AAEE Datasheet - Page 9

• Manufacturer Part Number: MAX6958AAEE
• Description: LED Drivers 2-Wire Interfaced, 3 V to 5.5V, 4-Digit,
• Manufacturer: Maxim Integrated Products

Specifications of MAX6958AAEE

• Number Of Digits: 4
• Number Of Segments: 36
• Low Level Output Current: 275000 uA
• High Level Output Current: 30000 uA
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Supply Current: 6700 uA
• Maximum Power Dissipation: 667 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: QSOP-16
• Minimum Operating Temperature: - 40 C

Table 3. Command Address
Autoincrement Behavior
If the MAX6958/MAX6959 are operated on a 2-wire
interface with multiple masters, a master reading the
MAX6958/MAX6959 should use a repeated start
between the write, which sets the MAX6958/MAX6959s’
address pointer, and the read(s) that takes the data
from the location(s) set by the address pointer. It is
possible for master 2 to take over the bus after master
1 has set up the MAX6958/MAX6959s’ address pointer
but before master 1 has read the data. If master 2 sub-
sequently changes the MAX6958/MAX6959s’ address
pointer, then master 1's delayed read may be from an
unexpected location.
Table 4. Register Address Map
ADDRESS RANGE
No-op
Decode mode
Intensity
Scan limit
Configuration
Factory reserved. Do not write to this register.
GPIO (MAX6959 only)
Display test
Read key debounced (MAX6959 only)
A write to this register is ignored.
Read key pressed (MAX6959 only)
A write to this register is ignored.
Digit 0
Digit 1
Digit 2
Digit 3
Segments
COMMAND BYTE
00000000 to
01111110
01111111
9-Segment LED Display Drivers with Keyscan
Operation with Multiple Masters
_______________________________________________________________________________________
Command byte address autoincrements
after byte read or written
Command byte address remains at
01111111 after byte written or read
REGISTER
AUTOINCREMENT BEHAVIOR
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
D15
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address autoincrementing allows the MAX6958/
MAX6959 to be configured with the shortest number of
transmissions by minimizing the number of times the
command byte needs to be sent. The address pointer
stored in the MAX6958/MAX6959 increments after each
data byte is written or read, unless the address equals
01111111 (Table 3).
The MAX6958/MAX6959 store display data in five regis-
ters. The four digit registers each control the seven
numeric segments of a seven-segment digit, but not
the DP segments. The segments register controls eight
individual LEDs, which can be any mix of discrete LEDs
and any or all of the DP segments of the four 7-seg-
ment digits (Table 5) (Figure 10).
Figure 10. Segment Labeling for 7-Segment Display
D13
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
Command Address Autoincrementing
COMMAND ADDRESS
D12
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D11
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
e
f
D10
a
g
d
0
0
0
0
1
1
1
1
0
1
0
0
0
0
1
Digit Type Registers
b
c
dp
D9
0
0
1
1
0
0
1
1
0
0
0
0
1
1
0
D8
0
1
0
1
0
1
0
1
0
0
0
1
0
1
0
CODE
0x0C
HEX
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x20
0x21
0x22
0x23
0x24
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