PCA9546A 4-channel I2C-bus switch with reset Rev. 6 — 30 April 2014 Product data sheet 1. General description The PCA9546A is a quad bidirectional translating switch controlled via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 3. Ordering information Table 1. Ordering information Type number Topside marking Package Name Description Version PCA9546ABS 546A HVQFN16 plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 4 0.85 mm SOT629-1 PCA9546AD PCA9546AD SO16 plastic small outline package; 16 leads; body width 3.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 4. Block diagram PCA9546A SC0 SC1 SC2 SC3 SD0 SD1 SD2 SD3 VSS VDD RESET SCL SDA SWITCH CONTROL LOGIC POWER-ON RESET INPUT FILTER A0 I2C-BUS CONTROL A1 A2 002aab188 Fig 1. PCA9546A Product data sheet Block diagram of PCA9546A All information provided in this document is subject to legal disclaimers. Rev. 6 — 30 April 2014 © NXP Semiconductors N.V. 2014. All rights reserved.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 5. Pinning information 5.1 Pinning A0 1 16 VDD A1 2 15 SDA RESET 3 14 SCL SD0 4 13 A2 PCA9546AD SC0 5 12 SC3 SD1 6 11 SD3 SC1 7 VSS 8 A0 1 16 VDD A1 2 15 SDA RESET 3 14 SCL SD0 4 SC0 5 SD1 6 11 SD3 SC1 7 10 SC2 VSS 8 10 SC2 9 SD2 PCA9546APW 12 SC3 9 002aab185 SD2 002aab186 RESET 16 A1 terminal 1 index area Pin configuration for TSSOP16 13 SDA Fig 3.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 5.2 Pin description Table 3.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 6.2 Control register Following the successful acknowledgement of the slave address, the bus master sends a byte to the PCA9546A, which is stored in the control register. If the PCA9546A receives multiple bytes, it saves the last byte received. This register can be written and read via the I2C-bus. channel selection bits (read/write) 7 6 5 4 3 2 1 0 X X X X B3 B2 B1 B0 channel 0 channel 1 channel 2 channel 3 002aab190 Fig 6.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 6.3 RESET input The RESET input is an active LOW signal which may be used to recover from a bus fault condition. By asserting this signal LOW for a minimum of tw(rst)L, the PCA9546A resets its registers and I2C-bus state machine and deselects all channels. The RESET input must be connected to VDD through a pull-up resistor. 6.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset More Information can be found in Application Note AN262: PCA954X family of I2C/SMBus multiplexers and switches. 7. Characteristics of the I2C-bus The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor when connected to the output stages of a device.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 6'$ 6&/ 0$67(5 75$160,77(5 5(&(,9(5 6/$9( 5(&(,9(5 6/$9( 75$160,77(5 5(&(,9(5 0$67(5 75$160,77(5 0$67(5 75$160,77(5 5(&(,9(5 , & %86 08/7,3/(;(5 6/$9( DDD Fig 10. System configuration 7.4 Acknowledge The number of data bytes transferred between the START and the STOP conditions from transmitter to receiver is not limited. Each byte of 8 bits is followed by one acknowledge bit.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 7.5 Bus transactions Data is transmitted to the PCA9546A control register using the Write mode as shown in Figure 12. slave address SDA S 1 1 1 0 A2 control register A1 A0 START condition 0 R/W A X X X X B3 B2 acknowledge from slave B1 B0 A P acknowledge from slave STOP condition 002aab196 Fig 12. Write control register Data is read from PCA9546A using the Read mode as shown in Figure 13.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 8. Application design-in information VDD = 2.7 V to 5.5 V VDD = 3.3 V SDA SDA SD0 SCL SCL SC0 V = 2.7 V to 5.5 V channel 0 V = 2.7 V to 5.5 V RESET I2C/SMBus master SD1 channel 1 SC1 V = 2.7 V to 5.5 V PCA9546A SD2 channel 2 SC2 V = 2.7 V to 5.5 V A2 A1 SD3 A0 SC3 channel 3 VSS 002aab198 Fig 14. Typical application PCA9546A Product data sheet All information provided in this document is subject to legal disclaimers.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 9. Limiting values Table 5. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to VSS (ground = 0 V)[1]. Symbol Parameter VDD VI Conditions Min Max Unit supply voltage 0.5 +7.0 V input voltage 0.5 +7.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 11. Static characteristics Table 7. Static characteristics at VDD = 2.3 V to 3.6 V VSS = 0 V; Tamb = 40 C to +85 C; unless otherwise specified. See Table 8 on page 14 for VDD = 4.5 V to 5.5 V.[1] Symbol Parameter Conditions Min Typ Max Unit Supply VDD supply voltage 2.3 - 3.6 V IDD supply current operating mode; VDD = 3.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset Table 8. Static characteristics at VDD = 4.5 V to 5.5 V VSS = 0 V; Tamb = 40 C to +85 C; unless otherwise specified. See Table 7 on page 13 for VDD = 2.3 V to 3.6 V.[1] Symbol Parameter Conditions Min Typ Max Unit 4.5 - 5.5 V Supply VDD supply voltage IDD supply current operating mode; VDD = 5.5 V; no load; VI = VDD or VSS; fSCL = 100 kHz - 65 100 A Istb standby current standby mode; VDD = 5.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 12. Dynamic characteristics Table 9. Dynamic characteristics Symbol Parameter Conditions Fast-mode I2C-bus Standard-mode I2C-bus from SDA to SDx, or SCL to SCx Unit Min Max Min Max - 0.3[1] - 0.3[1] ns 0 100 0 400 kHz 4.7 - 1.3 - s 4.0 - 0.6 - s 4.7 - 1.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset î 9'' 6'$ î 9'' WU W%8) WI W+' 67$ W63 W/2: î 9'' 6&/ î 9'' W+' 67$ 3 6 W+' '$7 W+,*+ W68 67$ W68 '$7 W68 672 6U 3 DDD Fig 15. Definition of timing on the I2C-bus ACK or read cycle START SCL SDA 30 % trst RESET 50 % 50 % 50 % tREC;STA tw(rst)L 002aac549 Fig 16.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 13.
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PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 14. Soldering of SMD packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 “Surface mount reflow soldering description”. 14.1 Introduction to soldering Soldering is one of the most common methods through which packages are attached to Printed Circuit Boards (PCBs), to form electrical circuits.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 14.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset temperature maximum peak temperature = MSL limit, damage level minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 21. Temperature profiles for large and small components For further information on temperature profiles, refer to Application Note AN10365 “Surface mount reflow soldering description”.
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PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 16. Abbreviations Table 12. PCA9546A Product data sheet Abbreviations Acronym Description CDM Charged-Device Model ESD ElectroStatic Discharge HBM Human Body Model IC Integrated Circuit I2C-bus Inter-Integrated Circuit bus LSB Least Significant Bit MM Machine Model MSB Most Significant Bit PCB Printed-Circuit Board SMBus System Management Bus All information provided in this document is subject to legal disclaimers.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 17. Revision history Table 13. Revision history Document ID Release date Data sheet status Change notice Supersedes PCA9546A v.6 20140430 Product data sheet - PCA9546A v.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 18. Legal information 18.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use.
PCA9546A NXP Semiconductors 4-channel I2C-bus switch with reset 20. Contents 1 2 3 3.1 4 5 5.1 5.2 6 6.1 6.2 6.2.1 6.3 6.4 6.5 7 7.1 7.2 7.3 7.4 7.5 8 9 10 11 12 13 14 14.1 14.2 14.3 14.4 15 16 17 18 18.1 18.2 18.3 18.4 19 20 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . .