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PCA9552PW Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA9552PW Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 21 page Philips Semiconductors Product data sheet PCA9552 16-bit I2C LED driver with programmable blink rates 2004 Oct 01 5 DEVICE ADDRESSING Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9552 is shown in Figure 4. To conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled HIGH or LOW. 1 1 0 0 A2 A1 A0 SLAVE ADDRESS su01420 FIXED HARDWARE SELECTABLE R/W Figure 4. Slave address The last bit of the address byte defines the operation to be performed. When set to logic 1 a read is selected, while a logic 0 selects a write operation. CONTROL REGISTER Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9552 which will be stored in the Control Register. This register can be read and written via the I2C-bus. 0 0 AI B2 B1 B0 0 SW00898 B3 AUTO-INCREMENT FLAG REGISTER ADDRESS RESET STATE: 00h Figure 5. Control register The lowest 3 bits are used as a pointer to determine which register will be accessed. If the auto-increment flag (AI) is set, the four low order bits of the Control Register are automatically incremented after a read or write. This allows the user to program the registers sequentially. The contents of these bits will rollover to ‘0000’ after the last register is accessed. When auto-increment flag is set (AI = 1) and a read sequence is initiated, the sequence must start by reading a register different from ‘0’ (B3 B2 B1 B0 0 0 0 0 0). Only the 4 least significant bits are affected by the AI flag. Unused bits must be programmed with zeroes. Control Register definition B3 B2 B1 B0 REGISTER NAME TYPE REGISTER FUNCTION 0 0 0 0 INPUT0 READ INPUT REGISTER 0 0 0 0 1 INPUT1 READ INPUT REGISTER 1 0 0 1 0 PSC0 READ/ WRITE FREQUENCY PRESCALER 0 0 0 1 1 PWM0 READ/ WRITE PWM REGISTER 0 0 1 0 0 PSC1 READ/ WRITE FREQUENCY PRESCALER 1 0 1 0 1 PWM1 READ/ WRITE PWM REGISTER 1 0 1 1 0 LS0 READ/ WRITE LED 0–3 SELECTOR 0 1 1 1 LS1 READ/ WRITE LED 4–7 SELECTOR 1 0 0 0 LS2 READ/ WRITE LED 8–11 SELECTOR 1 0 0 1 LS3 READ/ WRITE LED 12–15 SELECTOR REGISTER DESCRIPTION INPUT0 — INPUT REGISTER 0 LED 7 LED 6 LED 5 LED 4 LED 3 LED 2 LED 1 LED 0 bit 7 6 5 4 3 2 1 0 default X X X X X X X X The INPUT register 0 reflects the state of the device pins (inputs 0 to 7). Writes to this register will be acknowledged but will have no effect. NOTE: The default value “X” is determined by the externally applied logic level, normally ‘1’ when used for directly driving LED with pull-up to VDD. INPUT1 — INPUT REGISTER 1 LED 15 LED 14 LED 13 LED 12 LED 11 LED 10 LED 9 LED 8 bit 7 6 5 4 3 2 1 0 default X X X X X X X X The INPUT register 1 reflects the state of the device pins (inputs 8 to 15). Writes to this register will be acknowledged but will have no effect. NOTE: The default value “X” is determined by the externally applied logic level, normally ‘1’ when used for directly driving LED with pull-up to VDD. PSC0 — FREQUENCY PRESCALER 0 bit 7 6 5 4 3 2 1 0 default 1 1 1 1 1 1 1 1 PSC0 is used to program the period of the PWM output. The period of BLINK0 + (PSC0 ) 1) 44 |
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