PCA6416A: Low-voltage translating 16-bit I²C-bus/SMBus I/O expander
The PCA6416A is a 16-bit general purpose I/O expander that provides remote I/O expansion for most microcontroller families via the I²C-bus interface.
NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in battery-powered mobile applications for interfacing to sensors, push buttons, keypad, etc. In addition to providing a flexible set of GPIOs, it simplifies interconnection of a processor running at one voltage level to I/O devices operating at a different (usually higher) voltage level. The PCA6416A has built-in level shifting feature that makes these devices extremely flexible in mixed signal environments where communication between incompatible I/O voltages is required. Its wide VDD range of 1.65 V to 5.5 V on the dual power rail allows seamless communications with next-generation low voltage microprocessors and microcontrollers on the interface side (SDA/SCL) and peripherals at a higher voltage on the port side.
There are two supply voltages for PCA6416A: VDD(I²C-bus) and VDD(P). VDD (I²C-bus) provides the supply voltage for the interface at the master side (for example, a microcontroller) and the VDD(P) provides the supply for core circuits and Port P. The bidirectional voltage level translation in the PCA6416A is provided through VDD(I²C-bus). VDD(I²C-bus) should be connected to the VDD of the external SCL/SDA lines. This indicates the VDD level of the I²C-bus to the PCA6416A. The voltage level on Port P of the PCA6416A is determined by the VDD(P).
The PCA6416A register set consists of four pairs of 8-bit Configuration, Input, Output, and Polarity Inversion registers.
At power-on, the I/Os are configured as inputs. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register, saving external logic gates.
The system master can reset the PCA6416A in the event of a time-out or other improper operation by asserting a LOW in the RESET input. The power-on reset puts the registers in their default state and initializes the I²C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without depowering the part.
The PCA6416A open-drain interrupt (INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus. Thus, the PCA6416A can remain a simple slave device.
The device Port P outputs have 25 mA sink capabilities for directly driving LEDs while consuming low device current.
One hardware pin (ADDR) can be used to program and vary the fixed I²C-bus address and allow up to two devices to share the same I²C-bus or SMBus.
Outline 3d sot1199-1
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| Low-voltage translating 16-bit I2C-bus/SMBus I/O expander with interrupt output, reset, and configuration registers (REV 2.0) PDF (2.6 MB) PCA6416A | 10 Jan 2013 |
Users Guides (3)
| Name/Description | Modified Date |
|---|---|
| I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM10204 | 28 Apr 2014 |
| I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA | 03 Apr 2013 |
| I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206 | 13 Jun 2006 |
Brochures (1)
| Name/Description | Modified Date |
|---|---|
| NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 75017540 | 01 Aug 2014 |
Package Information (3)
| Name/Description | Modified Date |
|---|---|
| plastic very thin fine-pitch ball grid array package; 24 balls (REV 1.0) PDF (314.0 kB) SOT1199-1 | 08 Feb 2016 |
| plastic thin shrink small outline package; 24 leads; body width 4.4 mm (REV 1.0) PDF (353.0 kB) SOT355-1 | 08 Feb 2016 |
| plastic thermal enhanced very very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.75 mm (REV 1.0) PDF (213.0 kB) SOT994-1 | 08 Feb 2016 |
Packing (3)
| Name/Description | Modified Date |
|---|---|
| HWQFN24; Reel pack, SMD, 13" Q2/T3 standard product orientation Orderable part number ending ,128 or... (REV 1.1) PDF (190.0 kB) SOT994-1_128 | 15 Jul 2016 |
| VFBGA24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code... (REV 1.0) PDF (292.0 kB) SOT1199-1_118 | 08 Sep 2014 |
| TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 4.1) PDF (227.0 kB) SOT355-1_118 | 15 Apr 2013 |
Supporting Information (1)
| Name/Description | Modified Date |
|---|---|
| Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE | 08 Oct 2009 |
Design Support
- Expert mode sample code for 16-bit Totem Pole (REV 1.0) TXT 16-BIT-TOTEM-POLE-READ-WRITE 12/10/2014
Ordering Information
| Product | Status | No of bits | VDD [min] (V) | VDD [max] (V) | Over volt tolerant | No of supplies | Standby current [typ] (µA) | Max Sink Current per bit (mA) | Max Sink Current, per package (mA) | Source Current per bit (mA) | Interrupt output pin | Reset input pin | Output mode | Input mode: invert option | Internal pull-up resistor per bit (kOhm) | I2C-bus (kHz) | Footprint body and leads (mm2) | Package name | Package version | Operating Temperature (Cel) | No of Addresses |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA6416AHF | Active | 16 | 1.65 | 5.5 | Y | 2 | 0.5 | 25 | 200 | 10 | Y | Y | Totem pole | Y | No | 400 | 16.81 | HWQFN24 | SOT994-1 | -40~85 | 2 |
| PCA6416AEV | Active | 16 | 1.65 | 5.5 | Y | 2 | 0.5 | 25 | 200 | 10 | Y | Y | Totem pole | Y | No | 400 | 9.61 | VFBGA24 | SOT1199-1 | -40~85 | 2 |
| PCA6416APW | Active | 16 | 1.65 | 5.5 | Y | 2 | 0.5 | 25 | 200 | 10 | Y | Y | Totem pole | Y | No | 400 | 52.14 | TSSOP24 | SOT355-1 | -40~85 | 2 |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | EFR | IFR(FIT) | MTBF(hour) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA6416APW |  | SOT355-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA6416APW,118 (9352 935 08118) | PCA6416A | PCA6416APW |    | Always Pb-free | 0.0 | 4.0 | 2.5E8 | 1 | 1 |
| PCA6416AHF |  | SOT994-1 | Reel 13" Q2/T3 | Active | PCA6416AHF,128 (9352 934 67128) | 416A | PCA6416AHF | | Always Pb-free | 0.0 | 4.0 | 2.5E8 | 1 | 1 | |
| PCA6416AEV | | SOT1199-1 | Reel 13" Q1/T1 | Active | PCA6416AEVJ (9352 985 82118) | 416A | PCA6416AEV | | Always Pb-free | 0.0 | 4.0 | 2.5E8 | 1 | 1 |
- I2C-bus specification and user manual pca9685pw
- I2C-bus specification and user manual pca9685pw
- I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
- NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
- Expert mode sample code for 16-bit Totem Pole PCAL9555APW
- plastic thin shrink small outline package; 24 leads; body width 4.4 mm 74LVC4245A_Q100
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... 74LVC4245A_Q100
- plastic thermal enhanced very very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.75 mm pcal9555a
- HWQFN24; Reel pack, SMD, 13" Q2/T3 standard product orientation Orderable part number ending ,128 or... pcal9555a
- plastic very thin fine-pitch ball grid array package; 24 balls pcal6416a
- VFBGA24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code... pcal6416a
- SA639DH
- PCAL9555A
- PCAL6416A
