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LT8500
1
8500f
Typical applicaTion
FeaTures
DescripTion
48-Channel LED PWM Generator
with 12-Bit Resolution and 50MHz
Cascadable Serial Interface
The LT8500 is a pulse width modulation (PWM) genera-
tor with 48 independent channels. Each channel has an
individually adjustable 12-bit (4096-step) PWM register
and a 6-bit (64-step) ±50% correction register. All controls
are programmable via a simple serial data interface. Three
banks of 16-channels each can be configured such that
they operate 120° out-of-phase with each other.
The LT8500 features two diagnostic information flags:
synchronization error and open LED. The flags are sent,
withadditionalstateinformation,ontheserialdatainterface
duringstatusreadback.The50MHzcascadableserialdata
interface includes buffering and skew-balancing, making
the chip suitable for PWM intensive applications such
as large screen LCD dynamic backlighting and mono-,
multi- and full-color LED displays. The LT8500 is also
ideally suited to control three LT3595A LED drivers.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
applicaTions
n
3V to 5.5V Input Voltage
n
48 Independent PWM Outputs
n
TTL/CMOS Logic 50MHz Serial Data Interface
n
12-Bit (4096 Steps) PWM Width Resolution
n
6-Bit (64 Steps) PWM Correction
(±50% of Programmed PWM Width)
n
Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)
n
Phase-Shift Option Reduces Switching Noise
n
Directly Controls Three LT3595A 16-Channel
LED Drivers
n
Diagnostic Information: Sync Error/Open LED Flags
n
56-Pin (5mm × 9mm × 0.75mm) QFN Package
n
Large Screen Display LED Backlighting
n
Mono-, Multi-, Full-Color LED Displays
n
LED Billboards and Signboards
n
Motor Control
n
Industrial Control
n
Automated Test Equipment
n
Robotics
8500 TA01a
SDI
SCKI
LDIBLANK
PWMCK
OPENLED
SDO
SCK0
OSC
PWM[48:1]
48 PWM OUTPUTS
5-WIRE
SERIAL
DATA
INTERFACE
DIAGNOSTIC
CIRCUIT
PWM[48:1]
LT8500 (N)
LT8500 (2)
LT8500 (1)
48 PWM OUTPUTS
SDI
SCKI
LDIBLANK
PWMCK
OPENLED
SDO
SCK0
SDI
SCKI
LDIBLANK
PWMCK
OPENLED
SDO
SCK0
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