0.6 (2019–07–25)
Amlogic Proprietary and Confidential
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40
Note
1. Minimal VDDCPU voltage is for sleep mode while system runs at very low speed. Higher
clock will need higher voltage. Considering the power supply may have 3% deviation, the
minimal voltage in actual application should not be set to lower than min spec plus 0.02V.
2. Likewise, maximum VDDCPU voltage in actual application should be lower than the max
spec value minus 0.02V. Voltage of VDDCPU will affect CPU speed. Use lower voltage when
CPU runs on lower speed to save power. Recommend to use +/-1.5% or higher precision
DCDC.
3. GPIO cannot work if VDDIO voltage is out of the spec of LV / HV mode. GPIO output at HV
mode will be weaker & max operating speed will be lower if VDDIO are design to 3.0V. Do
not design VDDIO to lower than 3.0V in HV mode, recommend to use +/-1.5% or higher pre-
cision DCDC to supply power for VDDIO, actual voltage supplies to VDDIO (HV mode)
should not be lower than 2.9V.
4. For operating temperature, good heat sink may be needed to guarantee Tj < max spec.
5.3 Ripple Voltage Specifications
Please check below table for ripple voltage specifications.
Power Max Ripple Unit Test State
VDDCPU 40 +/-mV Run APK StabilityTest
VDD_EE and other 0.8V
domain
40 +/-mV Run APK Basemark ES
2.0 Taiji
DDR3 VDDQ and AVDD_
DDRPLL
60 +/-mV Kernel boot
DDR3L VDDQ and AVDD_
DDRPLL
60 +/-mV Kernel boot
LPDDR3 VDDQ and
AVDD_DDRPLL
40 +/-mV Kernel boot
DDR4 VDDQ and AVDD_
DDRPLL
40 +/-mV Kernel boot
LPDDR4 VDDQ and
AVDD_DDRPLL
40 +/-mV Kernel boot
AVDD18 30 +/-mV Kernel boot
VDD18_AO_XTAL 30 +/-mV Kernel boot
AVDD33 50 +/-mV WIFI SCAN
VDDIO LV 60 +/-mV Kernel boot
VDDIO HV 60 +/-mV WIFI SCAN
Note
Ripple specification is only a reference spec, customer should run stress/performance/reliability
test (high/low temperature test, damp and hot test, function test, etc...) on their product to
confirm the system stability.
5.4 Thermal Resistance
S905D3 Quick Reference Manual 5 Operating Conditions
Preliminary Version
Confidential for Wesion!
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