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PCA9538 데이터시트(PDF) 1 Page - Texas Instruments |
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PCA9538 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 29 page www.ti.com FEATURES DB, DBQ, DGV, DW, OR PW PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A0 A1 RESET P0 P1 P2 P3 GND VCC SDA SCL INT P7 P6 P5 P4 RGV PACKAGE (TOP VIEW) 16 6 8 2 10 P7 4 3 1 7 5 12 11 9 13 14 15 P6 INT SCL RESET P0 P1 P2 RGT PACKAGE (TOP VIEW) 16 6 8 2 10 P7 4 3 1 7 5 12 11 9 13 14 15 P6 INT SCL RESET P0 P1 P2 DESCRIPTION/ORDERING INFORMATION PCA9538 REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS SCPS126D – SEPTEMBER 2006 – REVISED MARCH 2007 • Low Standby Current Consumption of • Power-Up With All Channels Configured as 1 µA Max Inputs • I2C to Parallel Port Expander • No Glitch on Power Up • Open-Drain Active-Low Interrupt Output • Noise Filter on SCL/SDA Inputs • Active-Low Reset Input • Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs • Operating Power-Supply Voltage Range of 2.3 V to 5.5 V • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II • 5-V Tolerant I/O Ports • ESD Protection Exceeds JESD 22 • 400-kHz Fast I2C Bus – 2000-V Human-Body Model (A114-A) • Two Hardware Address Pins Allow up to Four Devices on the I2C/SMBus – 200-V Machine Model (A115-A) • Input/Output Configuration Register – 1000-V Charged-Device Model (C101) • Polarity Inversion Register This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)]. The PCA9538 consists of one 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low) 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 Port or Output Port register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master. The system master can reset the PCA9538 in the event of a timeout 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/SMBus state machine. The RESET pin causes the same reset/initialization to occur without powering down the part. The PCA9538 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 PCA9538 can remain a simple slave device. The device outputs (latched) have high-current drive capability for directly driving LEDs. It has low current consumption. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2006–2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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