Electronic Components Datasheet Search |
|
PCA9553DP01 Datasheet(PDF) 4 Page - NXP Semiconductors |
|
PCA9553DP01 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 18 page Philips Semiconductors Product data sheet PCA9553 4-bit I2C LED driver with programmable blink rates 2004 Oct 01 4 DEVICE ADDRESSING Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9553/01 is shown in Figure 3 and PCA9553/02 in Figure 4. 11 0 0 0 1 0 SLAVE ADDRESS SW01037 R/W Figure 3. Slave address — PCA9553/01 11 0 0 0 1 1 SLAVE ADDRESS SW01038 R/W Figure 4. Slave address — PCA9553/02 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 PCA9553 which will be stored in the Control Register. 0 0 AI B2 B1 B0 0 SW01034 0 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 is set, the three 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 ‘000’ 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’ (B2 B1 B0 0 0 0 0) Only the 3 least significant bits are affected by the AI flag. Unused bits must be programmed with zeroes. Control Register definition B2 B1 B0 REGISTER NAME TYPE REGISTER FUNCTION 0 0 0 INPUT READ INPUT REGISTER 0 0 1 PSC0 READ/ WRITE FREQUENCY PRESCALER 0 0 1 0 PWM0 READ/ WRITE PWM REGISTER 0 0 1 1 PSC1 READ/ WRITE FREQUENCY PRESCALER 1 1 0 0 PWM1 READ/ WRITE PWM REGISTER 1 1 0 1 LS0 READ/ WRITE LED SELECTOR REGISTER DESCRIPTION INPUT — INPUT REGISTER LED 3 LED 2 LED 1 LED 0 bit 7 6 5 4 3 2 1 0 default 0 0 0 0 X X X X The INPUT register reflects the state of the device pins. 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 PWM0 — PWM REGISTER 0 bit 7 6 5 4 3 2 1 0 default 1 0 0 0 0 0 0 0 The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off) when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is programmed with 00h, then the PWM0 output is always LOW. The duty cycle of BLINK0 is: 256 – PWM0 256 PSC1 — FREQUENCY PRESCALER 1 bit 7 6 5 4 3 2 1 0 default 1 1 1 1 1 1 1 1 PSC1 is used to program the period of PWM output. The period of BLINK1 + (PSC1 ) 1) 44 |
Similar Part No. - PCA9553DP01 |
|
Similar Description - PCA9553DP01 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |