enables energy monitoring with integration periods ranging from 1 ms to 36 hours. Bus voltage, sense resistor
voltage, and accumulated proportional power are stored in registers for retrieval by the system host or embedded
controller. For more information about the PAC1934, refer to the product
.
Four current sense resistors are populated on board for measuring voltage and current consumption on the power
rails:
• 10 mΩ on VDD_3V3 node—3.3V power rail power consumtion on SAMA7G5
• 10 mΩ on VDDIODDR node—1.35V power rail power consumption on SAMA7G5 DDR I/Os and on DDR3L
memory
• 10 mΩ on VDDCORE node—1.1V power rail power consumption on SAMA7G5 core
• 10 mΩ on VDDCPU node—1.275V power rail power consumption on SAMA7G5 CPU
Figure 3-8. PAC1934 Power Measurement Schematic
PAC1934
ADDRSEL 6
SLOW/ALERT 1
VDD 2
GND 3
VDD/IO 15
SENSE3-
7
8
SENSE4-
9
10
11
SENSE1-
12
13
SENSE2-
14
PWRDN 16
SM_DATA
5
SM_CLK 4
EP 17
U3
PAC1934_TWCK
PAC1934_TWD
GND
GND
0.1uF
10V
0402
C27
PAC1934_INT_PC8
Power Measurement and Distribution
10k
0402
1%
R14
10k
0402
1%
R15
0402
R16
SENSE1_P
SENSE1_N
SENSE2_P
SENSE2_N
SENSE3_P
SENSE3_N
SENSE4_P
SENSE4_N
4.7uF
10V
0402
C25
0.1uF
10V
0402
C26
4.7uF
10V
0402
C24
VDD_3V3
(3V3)
1
2
3 4
0.01R
1206 1%
0.75W
R20
VDDIODDR
TP13
(1V35)
1
2
3 4
0.01R
1206 1%
0.75W
R22
VDDCORE
TP10
(1V15)
1
2
3 4
0.01R
1206 1%
0.75W
R19
VDDCPU
TP12
(1V25)
1
2
3 4
0.01R
1206 1%
0.75W
R21
SENSE1_P
SENSE1_N
SENSE2_P
SENSE2_N
SENSE3_P
SENSE3_N
SENSE4_P
SENSE4_N
VDDUTMII
VDDIN33
VDD_3V3
VDD_1V35
VDD_1V15_OUT3
VDD_1V15_OUT4
(3V3)
(3V3)
VDD_3V3_MPU
4.7uF
10V
0402
C28
4.7uF
10V
0402
C29
GND
GND
0R
0603
R17
0R
0603
R18
VDD_3V3
TP11
Table 3-2. PAC1934 Signal Descriptions
PIO
Signal Name
Shared PIO
Signal Description
PC10
PAC1934_TWCK
PMIC
TWI clock signal
PC9
PAC1934_TWD
PMIC
TWI data signal
PC8
PAC1935_INT_PC8
–
PAC1934 interrupt
Table 3-3. PAC1934 TWI Address
Device
7-bit Client Address
Full Address with RD/WR#
PAC1934 TWI Read
0010_000
0x21
PAC1934 TWI Write
0x20
SAMA7G54-EK
Function Blocks
©
2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003273A-page 14