1. General description
The PCA9570 is a CMOS device that provides 4 bits of General Purpose parallel Output
(GPO) expansion in low voltage processor and handheld battery powered mobile
applications. It operates at 1 MHz I2C-bus speeds while maintaining backward
compatibility to Fast-mode (400 kHz) and Standard-mode (100 kHz).
The PCA9570 is a streamlined GPO that consists of 4-bit push-pull outputs that offer low
current consumption, small packaging options and a low operating voltage range of 1.1 V
to 3.6 V. The latched outputs are symmetrical 4 mA current drive capability at 3.3 V to
drive various control logic. The PCA9570 output expander provides a simple solution
when additional outputs are needed while keeping interconnections and floor space to a
minimum, for example, in battery powered mobile applications where PCBs are crowded
for interfacing to sensors, push buttons, etc.
The PCA9570 contains an internal Power-On Reset (POR) and a Software Reset feature
that initializes the device to its default state.
2. Features and benefits
 1 MHz I2C-bus interface with 6 mA SDA sink capability for lightly loaded buses
(<100 pF) and improved power consumption
 Compliant with the I2C-bus Fast and Standard modes
 1.1 V to 3.6 V operation
 Latched outputs with a sink/source capability of 4 mA at 3.3 V
 Readable device ID (manufacturer, device type, and revision)
 Software Reset
 Power-On Reset
 Low standby current
 40 C to +85 C operation
 ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22-C101
 Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
 Packages offered: TSSOP8, XQFN8 (0.4 mm lead pitch), XQFN8 (0.5 mm lead pitch)
3. Applications
 Smart phones and tablets
 Portable medical equipment
 Portable instrumentation and test measurement