Datasheet ALED1262ZT (STMicroelectronics) - 7

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ALED1262ZT Switching characteristics 4.1 Switching characteristics Table 5. Switching characteristics (VDDA = 12 V, VDDD = 5 V, Tj = 25 °C, unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit
fSCL I²C clock frequency 100 400 kHz fPWM GPWM frequency 500 Hz tPWM Output minimum ton by GPWM GPWMHIGH = 20 µs 5 µs fPWM_local Local dimming frequency (1) 200 220 240 Hz tPWM_local Local dimming minimum ton 5 µs Pulse width of spikes that must be t(SP) 50 ns suppressed by the input filter Bus free time between a STOP and t(BUF) 1.3 START condition tpd(ACK) SCL low to data out valid (acknowledge) 0.9 µs tLOW SCL low time 1.3 tHIGH SCL high time 0.6 tsu(DAT) SDA / SCL set-up time 100 tsu(STA) Set-up time for START condition 600 tsu(STO) Set-up time for STOP condition 600 th(DAT) Data input hold time 900 ns th(STA) START condition hold time 600 tr Rise time both of SDA and SCL signals 20 300 tf Fall time both of SDA and SCL signals 20 300 ton Output current turn-on time REXT = 4.99 kΩ IO = 60 mA 1.7 VDROP = 1.35 V µs toff Output current turn-off time 1.4 RL = 50 Ω CL= 10 pF Delay time from global_EN to output current regulation R t EXT = 4.99 kΩ IO = 60 mA n-reg (V 60 LED is enough for regulation) VDROP = 1.35 V µs tn-err Delay time from PG to output error detection RL = 50 Ω CL = 10 pF 70 1. Using prescaler bit (Faulty_ch_1 register bit[7]) local dimming frequency value can be reduced by half (typ. = 110 Hz)
DS12631
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Rev 4 page 7/69
Document Outline 1 Pin description 2 Absolute maximum ratings 3 Thermal characteristics 4 Electrical characteristics 4.1 Switching characteristics 5 Device pin functions 6 Driver dropout voltage 7 Device functional description 8 Error detection 9 Gradual output delay 10 Thermal warning and protection 11 Device local dimming function 12 Local dimming non-linear step table 13 Register descriptions 13.1 BDM_conf_1 / Enable_CH_1 register 13.2 BDM_conf_2 / Enable_CH_2 register 13.3 BDM_status register 13.4 Faulty_ch_1 register 13.5 Faulty_ch_2 register 13.6 PWM_gain_x register 13.7 LDD register (LED driver device versioning) 13.8 OTP/SAM_conf_1_2 register 13.9 OTP/SAM_conf_1 register 13.10 OTP/SAM_conf_2 register 13.11 OTP/BA_n_SAM_setting register 14 I²C bus operations 14.1 I²C main concepts 15 I²C addressing for the ALED1262ZT 16 I²C selectable Hamming (8, 4) encoding 17 Message structure 17.1 Available commands 17.2 Pattern symbols 17.3 Write operations 17.3.1 BDM configuration register write 17.3.2 FAULTY_ch1[7] bit register write (prescaler) 17.3.3 PWM_gain_x register write 17.3.4 BDM_conf and PWM_gain_x register write 17.3.5 Direct write on registers 17.4 Read operations 17.4.1 Status register 17.4.2 Faulty_ch registers 17.4.3 PWM_gain_x registers 17.4.4 BDM_conf, status, Faulty_ch, PWM_gain_x registers 17.4.5 Direct read from registers 18 OTP operations 18.1 OTP emulate 18.2 OTP burn 18.3 OTP read 19 I²C communication examples 19.1 Communication without parity detection 19.1.1 OTP burning with double zap and read back 19.1.2 All LEDs with power-ON 19.1.3 110 Hz dimming prescaler bit 19.1.4 All LEDs with PWM dimming at 50% (full configuration) 19.1.5 Device status read back 19.1.6 Device full status read back 19.1.7 LDD read back (device identifier) 19.2 Communication with parity detection 19.2.1 All LEDs with power-ON 20 LED supply voltage 21 Higher current requests (outputs in parallel) 22 PCB layout and external component guidelines 22.1 Signal integrity and EMI radiated/conducted immunity 22.2 Radiated emission reduction (EMI) 22.3 Device thermal management 22.4 PCB layout example 23 Package information 23.1 HTSSOP24 exposed pad package information Revision history