Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LED driver Linear TQFN 16 Surface-mount

MAX6965

9-Output LED Driver with Intensity Control

and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX6965 I

C-compatible serial interfaced periph-

eral provides microprocessors with nine additional out-

put ports. Each output is an open-drain current-sinking

output rated to 50mA at 7V. All outputs are capable of

driving 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

then 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 control.

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 MAX6965 supports hot insertion. The SDA, SCL,

RST, BLINK, and the slave address input AD0 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 MAX6965 is controlled through a 2-wire I

C serial

interface, and can be configured to one of four I

addresses.

Applications

LCD Backlights

LED Status Indication

Keypad Backlights

RGB LED Drivers

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 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))

♦ Tiny 3mm x 3mm, Thin QFN Package

♦ -40°C to +125°C Temperature Range

MAX6965

V+

3.3V

µC

SDA

SCL

SDA

I/O

AD0

SCL

RELAY

GND

0.047µF

RST

BLINK

RELAY

Typical Application Circuit

19-3058; Rev 3; 3/05

EVALUATION KIT

AVAILABLE

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX6965ATE

-40°C to

+125°C

16 Thin QFN

3mm x 3mm

x 0.8mm

AAW T1633-4

MAX6965AEE

-40°C to

16 QSOP

——

Pin Configurations appear at end of data sheet.

Cs.

Summary of content (22 pages)

PAGE 1
9-3058; Rev 3; 3/05 KIT ATION EVALU E L B A IL AVA 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Features The MAX6965 I2C-compatible serial interfaced peripheral provides microprocessors with nine additional output ports. Each output is an open-drain current-sinking output rated to 50mA at 7V. All 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
MAX6965 9-Output LED Driver 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–O8 ......................................................................-0.3V to +8V DC Current on O0 to O8 .....................................................55mA DC Current on SDA......................
PAGE 3
9-Output LED Driver 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 0.25 0.29 TA = TMIN to TMAX 0.31 0.13 0.25 TA = TMIN to TMAX 0.27 0.12 0.23 TA = TMIN to TMAX 0.25 ISINK = 6mA 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 RST Pulse Width tW Output Data Valid tDV CONDITIONS MIN TYP MAX 1 UNITS µs Figure 10 5 µs Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design.
PAGE 5
9-Output LED Driver with Intensity Control and Hot-Insertion Protection SCOPE SHOT OF TWO OUTPUT PORTS SINK CURRENT vs. VOL MAX6965 toc08 MAX6965 toc07 MASTER INTENSITY SET TO 1/15 0.35 MASTER INTENSITY SET TO 14/15 OUTPUT 1 2V/div ONLY ONE OUTPUT LOADED 0.30 OUTPUT 1 2V/div VOL (V) OUTPUT 2 2V/div OUTPUT 2 2V/div OUTPUT 2 INDIVIDUAL INTENSITY SET TO 14/15 OUTPUT 2 INDIVIDUAL INTENSITY SET TO 15/16 V+ = 2V 0.
PAGE 6
MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Functional Overview The MAX6965 is a general-purpose output (GPO) peripheral that provides nine output ports, O0–O8, controlled through an I2C-compatible serial interface. All outputs sink loads up to 50mA connected to external supplies up to 7V, independent of the MAX6965’s supply voltage. The MAX6965 is rated for a ground current of 190mA, allowing all nine outputs to sink 20mA at the same time.
PAGE 7
9-Output LED Driver with Intensity Control and Hot-Insertion Protection Serial Interface Serial Addressing The MAX6965 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
MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Table 1. MAX6965 I2C Slave Address Map PIN AD0 DEVICE ADDRESS A6 A5 A4 A3 A2 A1 A0 SCL 1 1 0 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
-Output LED Driver with Intensity Control and Hot-Insertion Protection S SLAVE ADDRESS 0 D15 D14 D13 D12 A D11 D10 D9 D8 COMMAND BYTE R/W MAX6965 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION ACKNOWLEDGE FROM MAX6965 A P ACKNOWLEDGE FROM MAX6965 Figure 7.
PAGE 10
MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Operation with Multiple Masters If the MAX6965 is operated on a 2-wire interface with multiple masters, a master reading the MAX6965 should use a repeated start between the write, which sets the MAX6965’s address pointer, and the read(s) that takes the data from the location(s) (Table 2).
PAGE 11
9-Output LED Driver with Intensity Control and Hot-Insertion Protection REGISTER FUNCTION ADDRESS CODE (HEX) POWER-UP CONDITION REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 Blink phase 0 outputs High-impedance outputs 0x01 1 1 1 1 1 1 1 1 User RAM 0xFF 0x03 1 1 1 1 1 1 1 1 Blink phase 1 outputs High-impedance outputs 0x09 1 1 1 1 1 1 1 1 Master, O8 intensity PWM oscillator is disabled; O8 is static logic output 0x0E 0 0 0 0 1 1 1 1 Configuration O8 is high-i
PAGE 12
Table 4.
PAGE 13
9-Output LED Driver with Intensity Control and Hot-Insertion Protection REGISTER R/W Write outputs phase 0 0 Read-back outputs phase 0 1 ADDRESS CODE (hex) 0x01 REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 Table 7. Blink Phase 1 Register REGISTER R/W Write outputs phase 1 0 Read-back outputs phase 1 1 ADDRESS CODE (hex) 0x09 REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 Table 8.
PAGE 14
MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Each output’s individual 4-bit intensity control only operates during the number of timeslots gated by the 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.
PAGE 15
9-Output LED Driver with Intensity Control and Hot-Insertion Protection Applications Information 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 Hot Insertion The RST input, BLINK input, and serial interface SDA, SCL, AD0 remain high impedance with up to 6V asserted on them when the MAX6965 is powered down (V+ = 0V). Output ports O0–O8 remain high impedance with up to 8V asserted on them. The MAX6965 can therefore be used in hot-swap applications.
PAGE 16
VSUPPLY is the supply voltage used to drive the LED (V). VLED is the forward voltage of the LED (V). VOL is the output low voltage of the MAX6964 when sinking ILED (V). ILED is the desired operating current of the LED (A). 2V TO 3.6V 0.047µF 7V For example, to operate a 2.2V red LED at 14mA from a 5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω.
PAGE 17
9-Output LED Driver with Intensity Control and Hot-Insertion Protection PWM DUTY OUTPUT CYCLE OUTPUT BLINK PHASE X (OR REGISTER GLOBAL) BIT = 0 INTENSITY SETTING LOW HIGH TIME TIME PWM DUTY CYCLE OUTPUT BLINK PHASE X REGISTER BIT = 1 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 9/16 7
PAGE 18
MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection Table 11.
PAGE 19
9-Output LED Driver with Intensity Control and Hot-Insertion Protection REGISTER R/W ADDRESS CODE (HEX) REGISTER DATA D7 D6 D5 MSB OUTPUTS O1, O0 INTENSITY D4 D3 LSB MSB OUTPUT O1 INTENSITY D2 D1 D0 LSB OUTPUT O0 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 1 0 — — — — — — — — — — — — — — Output O1 intensity duty
PAGE 20
RST 2 15 SDA ADO 3 14 SCL 13 08 O1 5 12 07 O2 6 11 06 O3 7 10 05 GND 8 9 V+ 14 O6 11 10 9 O5 7 O4 BLINK 15 6 GND RST 16 5 O3 04 1 QSOP 8 MAX6965ATE 2 3 4 O2 MAX6965AEE 13 12 O1 O0 4 SDA O7 16 V+ O0 BLINK 1 O8 TOP VIEW TOP VIEW SCL Pin Configurations AD0 MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection THIN QFN Chip Information TRANSISTOR COUNT: 17,611 PROCESS: BiCMOS 20 ___________________________________________________
PAGE 21
9-Output LED Driver with Intensity Control and Hot-Insertion Protection QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 F 1 ______________________________________________________________________________________ 1 21 MAX6965 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.
PAGE 22
Package Information (continued) (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.) (NE - 1) X e E MARKING 12x16L QFN THIN.EPS MAX6965 9-Output LED Driver with Intensity Control and Hot-Insertion Protection E/2 D2/2 (ND - 1) X e AAAA D/2 e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C C L 0.08 C C L A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.