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NCP5623CMUTBG Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP5623CMUTBG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page NCP5623C http://onsemi.com 8 B7 B6 B5 B4 B3 B2 B1 B0 Byte#1 : I2C Physical Address, based 7 bits : % 011 1001 ³ $39 * 0 1 1 1 0 0 1 R/W Byte#2 : DATA register RLED2 RLED1 RLED0 BLED4 BLED3 BLED2 BLED1 BLED0 *Note: according to the I2C specifications, the physical address is based on 7 bits out of the SDA byte, the 8th bit representing the R/W command. Since the NCP5623C is a receiver only, the R/W command is 0 and the hexadecimal byte send by the MCU is %0111 0010 = $72 B[7:5] : Internal Register Selection: B7 B6 B5 Function 0 0 0 Chip Shut Down ³ all LED current = zero 0 0 1 Set up the maximum Output LED Current 0 1 0 PWM1 : LED1 control 0 1 1 PWM2 : LED2 control 1 0 0 PWM3 : LED3 control 1 0 1 Set the Upward Iend target 1 1 0 Set the Downward Iend target 1 1 1 Set the number of steps and activate the Gradual Dimming The contain of bits B[4:0] depends upon the type of function selected by bits B[7:5] as depicted in Table 1 Table 1. Internal Register Bits Assigment B7 B6 B5 B4 B3 B2 B1 B0 Comments 0 0 0 X X X X X Shut down 0 0 1 16 8 4 2 1 Output LED Step, see Figure 4 (Note 11) 0 1 0 BPWM16 BPWM8 BPWM4 BPWM2 BPWM1 PWM1 0 1 1 BPWM16 BPWM8 BPWM4 BPWM2 BPWM1 PWM2 1 0 0 BPWM16 BPWM8 BPWM4 BPWM2 BPWM1 PWM3 1 0 1 GDIM5 16 GDIM4 8 GDIM3 4 GDIM2 2 GDIM1 1 Set Gradual Dimming Upward Iend Target (Note 12) 1 1 0 GDIM5 16 GDIM4 8 GDIM3 4 GDIM2 2 GDIM1 1 Set Gradual Dimming Downward Iend Target (Note 12) 1 1 1 GDIM5 128 ms GDIM4 64 ms GDIM3 32 ms GDIM2 16 ms GDIM1 8 ms Gradual Dimming Step Number & run 11. The programmed current applies to the three LED simultaneously, the gradual dimming is not engaged 12.The bit values represent the steps count, not the ILED current: see equations 1 & 2, page 7, to derive the ILED value. GRADUAL DIMMING The purpose of that function is to gradually Increase or Decrease the brightness of the backlight LED upon command from the external MCU. The function is activated and controlled by means of the I2C protocol. In order to avoid arithmetic division functions at silicon level, the period (either upward or downward) is equal to the time defined for each step, multiplied by the number of steps. To operate such a function, the MCU will provide three information: 1 – The target current level (either upward or downward) 2 – The time per step 3 – The Upward or Downward mode of operation When a new gradual dimming sequence is requested, the output current increases, according to an exponential curve, from the existing start value to the end value. The end current value is defined by the contain of the Upward or Downward registers, the width of each step is defined by the third register, the number of step being in the 1 to 30 range. In the event of software error, the system checks that neither the maximum output current (30 mA), nor the zero level are forced out of their respective bounds. Similarly, software errors shall not force the NCP5623C into an uncontrolled mode of operation. |
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