
LTC7151S
(12V => 3.3V)
VIN
3.3V
12V
12V
EN
PG
LT8609S E V
(12V => 5V)
VIN
12V
EN
5V
VR500 V9
VIN
3.3V
EN
SW1
1V
SW2
2.5V
SW4
1.35V
SW3
1.8V
RST_OUT
LDO2
LDO4
PS_DDR_EN
PS_VDD_EN
To CPLD
LTC7151S
(12V => 1V/
0.9V)
VIN
12V
EN
VDD
MC34716EP/R2
(12V => 1.2V
=> VTT, VREF)
VIN
3.3V
EN
VDD
PG
PG_B
12V
3.3V
soft-start from 12V
5V
soft-start from 3.3V PG
2.5V
VR500 S EQ2 internally programmed
1ms
VR500 S EQ3 internally programmed
1.8V
VR500 SW3
VIN
LTC7151S 3V3
LT8609S 3V3
VR500 SW2
1ms
VR500 S EQ4 internally programmed
1.35V
VR500 SW4
1ms
VR500 S EQ5 internally programmed
1.0V, LDO2
LTC7151S VDD
VDD (0.9/1V)
VR500 SW1, LDO2
soft-start after LDO2 (PS_VDD_E N)
tss
MC34716
DDR4 (1.2V, VTT, VRE F)
VR500 S EQ8 internally programmed
VR500 LDO4
LDO4
soft-start after LDO4 (PS_DDR_E N)
To CPLD
To CPLD
To CPLD
PS_3V3_PG
PS_VDD_PG
PS_V5V0_PG
PS_DDR_PG_B
PS_3V3_PG
RST_POR_B
PG
From DC jack
1ms
RST_OUT (to CPLD)
VR500 RST_OUT
Internal delay from last S EQ EVENT
3.87ms
1.8ms
2ms
3ms
6ms +
2.5ms +
3.2ms
2ms
Figure 6. Power up voltage sequence
The LS1028ARDB follows the power supply sequencing requirements as detailed in
QorIQ LS1028A Data Sheet
.
NOTE
LS1028ARDB Functional Description
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
20
COMPANY CONFIDENTIAL
NXP Semiconductors
Содержание QorIQ LS1028A
Страница 111: ......