PCA85073A: Automotive tiny Real-Time Clock/Calendar with alarm function and I²C-bus

Overview

The PCA85073A is a CMOS¹ Real-Time Clock (RTC) and calendar optimized for low power consumption. An offset register allows fine-tuning of the clock. All addresses and data are transferred serially via the two-line bidirectional I²C-bus. Maximum data rate is 400 kbit/s. The register address is incremented automatically after each written or read data byte.

Features

AEC-Q100 grade 2 compliant for automotive applications
Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
Low current; typical 0.25 µA at V_DD = 3.0 V and T_amb = 25 °C
Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
Alarm function
Minute and half minute interrupt
Internal Power-On Reset (POR)
High temperature operation range: —40 °C to +105 °C
Clock operating voltage: 0.9 V to 5.5 V
400 kHz two-line I²C-bus interface (at V_DD = 1.8 V to 5.5 V)
Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
Countdown timer
Oscillator stop detection function
Programmable offset register for frequency adjustment
Latch-up performance exceeds 100 mA per JESD 78, Class II
ESD protection exceeds JESD 22
- 4000 V Human-Body Model (A114-A)
- 1000 V Charged-Device Model (C101)
Package offered: TSSOP8

Features

AEC-Q100 grade 2 compliant for automotive applications
Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
Low current; typical 0.25 µA at V_DD = 3.0 V and T_amb = 25 °C
Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
Alarm function
Minute and half minute interrupt
Internal Power-On Reset (POR)
High temperature operation range: —40 °C to +105 °C
Clock operating voltage: 0.9 V to 5.5 V
400 kHz two-line I²C-bus interface (at V_DD = 1.8 V to 5.5 V)
Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
Countdown timer
Oscillator stop detection function
Programmable offset register for frequency adjustment
Latch-up performance exceeds 100 mA per JESD 78, Class II
ESD protection exceeds JESD 22
- 4000 V Human-Body Model (A114-A)
- 1000 V Charged-Device Model (C101)
Package offered: TSSOP8