PAC5220 Datasheet, PDF (31/73 Pages) Active-Semi, Inc – Power Application Controller

PAC5220
Power Application Controller
and another mask bit to prevent or allow it to activate protection event PR2. These two protection events can be
used directly by protection circuitry in the Application Specific Power Drivers (ASPD) to protect devices being
driven.
11.2.6. Analog Output Buffer (BUF)
A subset of the signals from the configurable analog signal matrix CASM can be multiplexed to the BUF6 pin for
external use. The buffer offset voltage can be minimized with the built-in swap function.
11.2.7. Analog Front End I/O (AIO)
Up to 10 AIOx pins are available in the device. In the analog front end I/O mode, the pin can be configured to be
a digital input or digital open-drain output. The AIOx input or output signal can be set to a data input or output
register bit, or multiplexed to one of the signals in the configurable digital signal matrix CDSM. The signal can be
set to active high (default) or active low, with VSYS supply rail. Where AIO6,7,8,9 supports microcontroller interrupt
for external signals. Each has two mask bits to prevent or allow rising or falling edge of its corresponding digital
input to trigger second microcontroller interrupt INT2.
11.2.8. Push Button (PBTN)
The push button PBTN, when enabled, can be used by the microcontroller to detect a user active-low push
button event and to put the system into an ultra-low-power hibernate mode. Once the system is in hibernate
mode, PBTN can be used to wake up the system. In addition, PBTN can also be used as a hardware reset for
the microcontroller when it is held low for longer than 8s during normal operation. The PBTN input is active low
and has a 55kΩ pull-up resistor to 3V.
11.2.9. HP DAC and LP DAC
The 8-bit HP DAC can be used as the comparison voltage for the high-speed protection (HP) comparators, or
routed for general purpose use via the AB2 signal in the CASM. The HP DAC output full scale voltage is 2.5V.
The 10-bit LP DAC can be used as the comparison voltage for the limit protection (LP) comparators, or routed
for general purpose use via the AB3 signal in the CASM. The LP DAC output full scale voltage is 2.5V.
11.2.10. ADC Pre-Multiplexer
The ADC pre-multiplexer is a 16-to-1 multiplexer that selects between the 3 differential programmable gain
amplifier outputs, AB1 through AB9, temperature monitor signal (VTEMP), power monitor signal (VMON), and offset
calibration reference (VREF / 2). The ADC pre-multiplexer can be directly controlled or automatically scanned by
the auto-sampling sequencer.
When the ADC pre-multiplexer is automatically scanned, the unbuffered or sensitive signals should be masked
by setting appropriate register bits.
11.2.11. Configurable Analog Signal Matrix (CASM)
The CASM has 9 general purpose analog signals labeled AB1 through AB9 that can be used for:
 Routing the single-ended programmable gain amplifier or analog feed-through output to AB1 through AB9
 Routing an analog signal via AB1, AB2, or AB3 to the negative input of a general purpose comparator or
phase comparator
 Routing the 8-bit HP DAC output to AB2
 Routing the 10-bit LP DAC output to AB3
 Routing analog signals via AB1 through AB12 to the ADC pre-multiplexer
 Routing phase comparator feed-through signals to AB7, AB8, and AB9, and averaged voltage to AB1
11.2.12. Configurable Digital Signal Matrix (CDSM)
The CDSM has 7 general purpose bi-directional digital signals labeled DB1 through DB7 that can be used for:
- 31 -
Rev 1.0‒February 25, 2014