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PAC1941T-1E/4MX. Datasheet(PDF) 21 Page - Microchip Technology

Part # PAC1941T-1E/4MX.
Description  Single/Multi-Channel Power Monitor with Accumulator, 9V Full-Scale Range
PDF  96 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PAC1941T-1E/4MX. Datasheet(HTML) 21 Page - Microchip Technology

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 2021 Microchip Technology Inc.
DS20006543A-page 21
PAC194X
4.0
GENERAL DESCRIPTION
The PAC194X is an up to four-channel, bidirectional,
high-side/low-side current-sensing device with preci-
sion voltage measurement capabilities, DSP for power
calculation and a power accumulator. PAC1941,
PAC1942 and PAC1943 are one, two and three-chan-
nel versions of the PAC1944. These devices measure
the voltage developed across an external sense resis-
tor (VSENSE) to represent the current of a battery or
voltage regulator.
The PAC194X also measures the SENSE+ pin
voltages (VBUS). Both VBUS and VSENSE are converted
to digital results by a 16-bit ADC and the digital results
are multiplied to give VPOWER. The VPOWER results are
accumulated on-chip, which enables energy measure-
ment over the accumulation period.
The PAC194X has an I2C/SMBus interface for digital
control and reading results. A system diagram is shown
in Figure 4-1.
FIGURE 4-1:
PAC194X-1 Typical Application Diagram.
FIGURE 4-2:
PAC194X-2 Low-Side Typical Application Diagram.
PAC194X
System
Host
SM_DATA
SM_CLK
VSOURCE 0V – 9V
Sense
Resistors
VDD
1.62V to 5.5V
Digital Supply
GND
2.7V to 5.5V
VSOURCE 0V – 9V
VSOURCE 0V – 9V
VSOURCE 0V – 9V
Load
Load
Load
Load
SLOW/ALERT1
PWRDN
ADDRSEL
GPIO/ALERT2
PAC1942-2
System
Host
SMDATA
SMCLK
Sense
Resistor
VDD
1.62V to 5.5V
Digital Supply
GND
2.7V to 5.5V
VSOURCE 0V – >>40v
Load
ALERT1
PWRDWN
ADDRSEL
ALERT2
VSOURCE 0V – 9V
Load
Sense Resistor
Note:
The application depicts a low-side configuration for Channel 2 and a high-side configuration for Channel 1.



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