MAX6956ATL+ Maxim Integrated Products, MAX6956ATL+ Datasheet - Page 7

• Manufacturer Part Number: MAX6956ATL+
• Description: IC DRVR DSPL LED 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6956ATL+

• Display Type: LED
• Interface: I²C
• Current - Supply: 180µA
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Number Of Segments: 28
• Low Level Output Current: 18000 uA
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Supply Current: 270 uA
• Maximum Power Dissipation: 2105 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Configuration: -
• Digits Or Characters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 1. MAX6956 Functional Diagram
Shutdown mode is temporarily overridden by the dis-
play test function.
The MAX6956 operates as a slave that sends and
receives data through an I
face. The interface uses a serial data line (SDA) and a
serial clock line (SCL) to achieve bidirectional commu-
nication between master(s) and slave(s). A master (typ-
ically a microcontroller) initiates all data transfers to and
from the MAX6956, and generates the SCL clock that
synchronizes the data transfer (Figure 2).
The MAX6956 SDA line operates as both an input and
an open-drain output. A pullup resistor, typically 4.7kΩ,
_______________________________________________________________________________________________________
LED DRIVERS
28-Port LED Display Driver and I/O Expander
P4 TO P31
OR GPIO
AD0
AD1
SDA
SCL
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
D0
7-BIT DEVICE ADDRESS
SEGMENT OR
GPIO DATA
LED DRIVERS AND GPIO
SLAVE ADDRESS BYTE
MATCHER
ADDRESS
2
D1
C-compatible 2-wire inter-
8
7
Serial Interface
7
D2
Serial Addressing
CONFIGURATION
D3
DATA BYTE
INTENSITY
R/W
R/W
8
TEST
D4
D5
D6
TO/FROM DATA REGISTERS
D7
DATA BYTE
PORT CHANGE
DETECTOR
D8
is required on SDA. The MAX6956 SCL line operates
only as an input. A pullup resistor, typically 4.7kΩ, is
required on SCL if there are multiple masters on the 2-
wire interface, or if the master in a single-master system
has an open-drain SCL output.
Each transmission consists of a START condition
(Figure 3) sent by a master, followed by the MAX6956
7-bit slave address plus R/ W bit (Figure 6), a register
address byte, one or more data bytes, and finally a
STOP condition (Figure 3).
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master
D9
D10
COMMAND BYTE
D11
REGISTER DECODE
D12
COMMAND
DATA
INTENSITY REGISTERS
COMMAND BYTE
TO COMMAND REGISTERS
PORT REGISTERS
8
TEST REGISTER
MASK REGISTER
CONFIGURATION
Start and Stop Conditions
D13
8
REGISTERS
CE
D14
R/W
D15
MAX6956
7