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General Description

The MAX6964 I

C-compatible serial interfaced periph-

eral provides microprocessors with 17 output ports.

Each output is an open-drain current-sinking output

rated at 50mA and 7V. The outputs are capable of dri-

ving LEDs, or providing logic outputs with external

resistive pullup up to 7V.

Eight-bit PWM current control is also integrated. Four of

the bits are global control and apply to all LED outputs

to provide coarse adjustment of current from fully off to

fully on with 14 intensity steps. Additionally, each output

has an individual 4-bit control, which further divides the

globally set current into 16 more steps. Alternatively,

the current control can be configured as a single 8-bit

control that sets all outputs at once.

Each output has independent blink timing with two blink

phases. LEDs can be individually set to be either on or

off during either blink phase, or to ignore the blink con-

trol. The blink period is controlled by an external clock

(up to 1kHz) on BLINK or by a register. The BLINK

input can also be used as a logic control to turn the

LEDs on and off, or as a general-purpose input (GPI).

The MAX6964 supports hot insertion. The SDA, SCL,

RST, BLINK, and the slave address input ADO remain

high impedance in power-down (V+ = 0V) with up to 6V

asserted upon them. The output ports remain high

impedance with up to 8V asserted upon them.

The MAX6964 is controlled through a 2-wire I

serial interface, and can be configured to one of four

C addresses.

Applications

Features

♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant

♦ 2V to 3.6V Operation

♦ Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Plus Individual 16-Step Intensity Controls

♦ Two-Phase LED Blinking

♦ High Port Output Current—Each Port 50mA (max)

♦ RST Input Clears the Serial Interface and

Restores Power-Up Default State

♦ Supports Hot Insertion

♦ Outputs are 7V-Rated Open Drain

♦ Low Standby Current (1.2µA (typ), 3.3µA (max))

♦ Small 4mm x 4mm, 0.8mm High Thin QFN Package

♦ -40°C to +125°C Temperature Range

MAX6964

17-Output LED Driver/GPO with

Intensity Control and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

RST

O16

V+

SDA

SCL

O10

131415161718

GND

BLINK

O15

O14

O13

O12

O11

AD0

23456

TOP VIEW

QFN

MAX6964

Pin Configurations

19-3179; Rev 3; 3/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG CODE

MAX6964ATG

-40°C to +125°C

24 Thin QFN

4mm x 4mm

x 0.8mm

T2444-4

MAX6964AEG

-40°C to +125°C

24 QSOP —

Pin Configurations continued at end of data sheet.

LCD Backlights

LED Status Indication

Keypad Backlights

RGB LED Drivers

Typical Application Circuit at end of data sheet.

Summary of content (23 pages)

PAGE 1
9-3179; Rev 3; 3/05 KIT ATION EVALU LE B A IL A AV 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Features The MAX6964 I2C-compatible serial interfaced peripheral provides microprocessors with 17 output ports. Each output is an open-drain current-sinking output rated at 50mA and 7V. The outputs are capable of driving LEDs, or providing logic outputs with external resistive pullup up to 7V. ♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant ♦ 2V to 3.
PAGE 2
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ .............................................................................-0.3V to +4V SCL, SDA, AD0, BLINK, RST ...................................-0.3V to +6V O0–O16 ....................................................................-0.3V to +8V DC Current on O0 to O16 ...................................................55mA DC Current on SDA...................
PAGE 3
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection (Typical Operating Circuit, V+ = 2V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA= + 25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TA = +25°C V+ = 2V, ISINK = 20mA VOL V+ = 2.5V, ISINK = 20mA Output Low-Voltage SDA PWM Clock Frequency VOLSDA 0.15 0.26 0.3 TA = TMIN to TMAX 0.32 0.13 0.26 TA = TMIN to TMAX 0.28 0.12 0.24 TA = TMIN to TMAX 0.26 ISINK = 6mA V V 0.
PAGE 4
TIMING CHARACTERISTICS (continued) (Typical Operating Circuit, V+ = 2V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL Capacitive Load for Each Bus Line Cb RST Pulse Width tW Output Data Valid tDV CONDITIONS MIN TYP (Note 3) MAX UNITS 400 pF 1 ns Figure 10 5 ns Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design.
PAGE 5
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection SCOPE SHOT OF OUTPUT PORTS SINK CURRENT vs. VOL MAX6964 toc08 MAX6964 toc07 0.35 MASTER INTENSITY SET TO 1/15 MASTER INTENSITY SET TO 14/15 ONLY ONE OUTPUT LOADED OUTPUT 1 2V/div OUTPUT 1, 2V/div 0.30 VOL (V) OUTPUT 2, 2V/div OUTPUT 2 2V/div OUTPUT 2 INDIVIDUAL INTENSITY SET TO 15/16 OUTPUT 2 INDIVIDUAL INTENSITY SET TO 14/15 V+ = 2V 0.
PAGE 6
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Functional Overview The MAX6964 is a general-purpose output (GPO) peripheral that provides 17 output ports, O0–O16, controlled through an I2C-compatible serial interface. All outputs sink loads up to 50mA connected to external supplies up to 7V, independent of the MAX6964’s supply voltage. The MAX6964 is rated for a ground current of 350mA, allowing all 17 outputs to sink 20mA at the same time.
PAGE 7
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Serial Interface Serial Addressing The MAX6964 operates as a slave that sends and receives data through an I2C-compatible 2-wire interface. The interface uses a serial data line (SDA) and a serial clock line (SCL) to achieve bidirectional communication between master(s) and slave(s).
PAGE 8
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Table 1. MAX6964 Address Map PIN AD0 DEVICE ADDRESS A6 A5 A4 A3 A2 A1 A0 0 SCL 1 1 0 0 0 0 SDA 1 1 0 0 1 0 0 GND 0 1 0 0 0 0 0 V+ 0 1 0 0 1 0 0 Table 2.
PAGE 9
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection S SLAVE ADDRESS 0 D15 A D14 D13 D12 D11 D10 D9 D8 COMMAND BYTE A R/W MAX6964 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION ACKNOWLEDGE FROM MAX6964 P ACKNOWLEDGE FROM MAX6964 Figure 7.
PAGE 10
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection ing the MAX6964’s command byte by performing a write (Figure 7). The master can now read n consecutive bytes from the MAX6964 with the first data byte being read from the register addressed by the initialized command byte. When performing read-after-write verification, remember to reset the command byte’s address because the stored command byte address has been autoincremented after the write (Table 2).
PAGE 11
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection REGISTER FUNCTION POWER-UP CONDITION ADDRESS CODE (hex) D7 D6 D5 D4 D3 D2 D1 D0 Blink phase 0 outputs O7–O0 High-impedance outputs 0x02 1 1 1 1 1 1 1 1 Blink phase 0 outputs O15–O8 High-impedance outputs 0x03 1 1 1 1 1 1 1 1 User RAM0 0xFF 0x06 1 1 1 1 1 1 1 1 User RAM1 0xFF 0x07 1 1 1 1 1 1 1 1 Blink phase 1 outputs O7–O0 High-impedance outputs 0x0A 1 1 1 1 1 1 1 1
PAGE 12
Table 4.
PAGE 13
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection REGISTER R/W Write outputs O7–O0 phase 0 0 Read back outputs O7–O0 phase 0 1 Write outputs O15–O8 phase 0 0 Read back outputs O15–O8 phase 0 1 ADDRESS CODE (hex) REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 0x02 OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 0x03 OP15 OP14 OP13 OP12 OP11 OP10 OP9 OP8 Table 7.
PAGE 14
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection master intensity. The individual controls provide 16 intensity settings from 1/16 through 16/16 (Table 12). Figures 16, 17, and 18 show examples of individual intensity control settings. The highest value an individual or global setting can be set to is 16/16. This setting forces the output to ignore the master control, and follow the logic level set by the appropriate blink phase register bit.
PAGE 15
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection up to 8V asserted on them. The MAX6964 can therefore be used in hot-swap applications. Output Level Translation The open-drain output architecture allows the ports to level translate the outputs to higher or lower voltages than the MAX6964 supply. An external pullup resistor can be used on any output to convert the high-impedance logic-high condition to a positive voltage level.
PAGE 16
For example, to operate a 2.2V red LED at 14mA from a 5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω. 2V TO 3.6V 5V Driving Load Currents Higher than 50mA 0.047µF The MAX6964 can be used to drive loads drawing more than 50mA, like relays and high-current white LEDs, by paralleling outputs. Use at least one output per 50mA of load current; for example, a 6V 330mW relay draws 55mA and needs two paralleled outputs to drive it.
PAGE 17
-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection OUTPUT (OR GLOBAL) INTENSITY SETTING PWM DUTY CYCLE OUTPUT BLINK PHASE X REGISTER BIT = 0 PWM DUTY CYCLE OUTPUT BLINK PHASE X REGISTER = 1 LOW TIME HIGH TIME LOW TIME HIGH TIME 0x0 1/16 15/16 15/16 1/16 0x1 2/16 14/16 14/16 2/16 0x2 3/16 13/16 13/16 3/16 0x3 4/16 12/16 12/16 4/16 0x4 5/16 11/16 11/16 5/16 0x5 6/16 10/16 10/16 6/16 0x6 7/16 9/16 9/16 7/16 0x7 8/16 8/16 8/16 8/16 0x8 9
PAGE 18
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Table 11.
PAGE 19
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection REGISTER ADDRESS CODE (hex) R/W REGISTER DATA D7 D6 D5 MSB OUTPUTS O1, O0 INTENSITY D4 D3 D2 D1 D0 LSB MSB OUTPUT O1 INTENSITY Write output O1, O0 intensity 0 Read back output O1, O0 intensity 1 Output O1 intensity duty cycle is 1/16 Output O1 intensity duty cycle is 2/16 Output O1 intensity duty cycle is 3/16 — 0 0 — — — — Output O1 intensity duty cycle is 14/16 — 1 1 Output O1 intensity duty cycle i
PAGE 20
MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection Table 12.
PAGE 21
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection 7V 3.3V 0.047µF O0 V+ µC O1 SDA SDA O2 SCL SCL O3 I/O BLINK I/O RST O4 O5 O6 MAX6964 O7 O8 O9 AD0 O10 O11 RELAY O12 O13 O14 GND 5V O15 O16 3.
PAGE 22
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) QSOP.EPS MAX6964 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection PACKAGE OUTLINE, QSOP .150", .
PAGE 23
17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection 24L QFN THIN.EPS PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 1 2 PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.