62
HX3 Kits User Guide, Doc. #: 001-91203 Rev. *D
Hardware
The power (5-V VBUS) to downstream ports is controlled using a power switch (U5, TPS2556DRBT)
as shown in
. This switch gets input from the 5-V AC-DC adapter connected to the hard-
ware. The output of the power switch can be enabled and disabled by the HX3 using the Power
Enable (PWR_EN_DS) GPIO.
After the output of the power switch is enabled, it monitors the current consumed by all the devices
attached to the downstream ports in ganged mode. When the total current consumed exceeds
4.85 A, the power switch interrupts the HX3. The HX3 in turn immediately disables the output of the
power switch by pulling the Power Enable (PWR_EN_DS) GPIO HIGH. This disables the power (5-V
VBUS) to all four downstream ports; the hub controller notifies the PC that all the downstream ports
are shut down.
Figure 5-3. Overcurrent Monitoring and Controlling of Downstream Ports Using Power Switch
lists the decoupling and bulk capacitors used on CY4609.
Note:
for schematics with a reduced BOM.
Table 5-2. Decoupling and Bulk Capacitors on CY4609
Power Domain
(Pin Numbers)
Description
Bulk Capacitor for the
Group
Decoupling Capacitor
Per Pin
AVDD12 (10,16,34,46,52) 1.2 V for SS PHY RX
0.1 µF, 1 µF, and 22 µF 0.01 µF and 0.001 µF
AVDD12 (53)
1.2 V for clock domain
1 µF
0.1 µF and 0.01 µF
DVDD12 (1,3,19,27)
1.2 V for core
22 µF and 1 µF
0.1 µF and 0.01 µF
DVDD12 (7,13,37,43,49)
1.2 V for SS PHY TX
0.1 µF, 1 µF, and 22 µF 0.001 µF and 0.01 µF
AVDD33 (56,61,66)
3.3 V for internal PLL
1 µF and 22 µF
0.1 µF and 0.01 µF
AVDD33 (4)
3.3 V for USB 3.0 PHY
22 µF and 1 µF
0.1 µF and 0.01 µF
VDDIO (28)
3.3 V for I/Os
–
0.1 µF and 0.01 µF
RILIM
PWR SWITCH
29
30
PWR_EN
OVRCURR
PWR_EN_DS
OVCUR_DS
PWR_EN_DS
VCC_5V
VBUS
V3p3
V3p3
R1
10K
R8
10K
G
DS
Q2
BSN20-7
2
1
3
U5
TPS2556DRBT
GND
1
IN1
2
IN2
3
EN
4
ILIM
5
OUT2
7
OUT1
6
FAULT
8
PAD
9
R29
100E
TP11
R3
22.
1K
_1%
TP12
R28
0R_0402
C3
0.1UF_16V
Summary of Contents for CY4603
Page 16: ...16 HX3 Kits User Guide Doc 001 91203 Rev D Software Installation ...
Page 40: ...40 HX3 Kits User Guide Doc 001 91203 Rev D Kit Operation ...
Page 58: ...58 HX3 Kits User Guide Doc 001 91203 Rev D HX3 Blaster Plus Tool ...
Page 92: ...92 HX3 Kits User Guide Doc 001 91203 Rev D ...
Page 94: ...94 HX3 Kits User Guide Doc 001 91203 Rev D Index ...
