CY7C63903-PVXC Cypress Semiconductor Corp, CY7C63903-PVXC Datasheet - Page 19

• Manufacturer Part Number: CY7C63903-PVXC
• Description: IC USB PERIPHERAL CTRLR 28-SSOP
• Manufacturer: Cypress Semiconductor Corp
• Series: CY7Cr

Specifications of CY7C63903-PVXC

• Controller Type: USB Peripheral Controller
• Interface: USB
• Voltage - Supply: 4 V ~ 5.5 V
• Current - Supply: 40mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-QSOP
• For Use With: 770-1001 - ISP 4PORT CYPRESS ENCORE II MCUCY4623 - KIT MOUSE REFERENCE DESIGN428-1774 - EXTENSION KIT FOR ENCORE II428-1773 - KIT DEVELOPMENT ENCORE II
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document 38-08035 Rev. *E
10.1.3
Table 10-2. XOSC Trim (XOSCTR) [0x35] [R/W]
10.1.4
Table 10-3. LPOSC Trim (LPOSCTR) [0x36] [R/W]
This register is used to calibrate the external crystal oscillator. The reset value is undefined but during boot the SROM writes a
calibration value that is determined during manufacturing test. This is the meaning of ‘D’ in the Default field
Bit [7:5]: Reserved
Bit [4:2]: XOSC XGM [2:0]
Amplifier transconductance setting. The Xgm settings are recommended for resonators with frequencies of interest for the
enCoRe II as below
Bit 1: Reserved
Bit 0: Mode
0 = Oscillator Mode
1 = Fixed Maximum Bias test Mode
This register is used to calibrate the 32-KHz Low-speed Oscillator. The reset value is undefined but during boot the SROM writes
a calibration value that is determined during manufacturing test. This value should not require change during normal use. This
is the meaning of ‘D’ in the Default field. If the 32-KHz Low-power bit needs to be written, care should be taken not to disturb
the 32-KHz Bias Trim and the 32-KHz Freq Trim fields from their factory calibrated values
Bit 7: 32-KHz Low Power
0 = The 32-KHz Low-speed Oscillator operates in normal mode
1 = The 32-KHz Low-speed Oscillator operates in a low-power mode. The oscillator continues to function normally but with
reduced accuracy
Bit 6: Reserved
Bit [5:4]: 32-KHz Bias Trim [1:0]
These bits control the bias current of the low-power oscillator.
0 0 = Mid bias
0 1 = High bias
1 0 = Reserved
1 1 = Disable (off)
Important Note: Do not program the 32-KHz Bias Trim [1:0] field with the reserved 10b value as the oscillator does not oscillate
at all corner conditions with this setting
Bit [3:0]: 32-KHz Freq Trim [3:0]
These bits are used to trim the frequency of the low-power oscillator
Read/Write
Read/Write
12-MHz Ceramic
12-MHz Crystal
24-MHz Crystal
6-MHz Ceramic
6-MHz Crystal
Default
Default
Field
Field
Bit #
Bit #
Resonator
External Clock Trim
LPOSC Trim
32-KHz Low
Power
R/W
D
7
–
0
7
XGM Setting
001
011
111
001
011
Reserved
Reserved
D
6
–
0
6
–
Worst Case R (Ohms)
403
201
101
70.4
41
32-KHz Bias Trim [1:0]
R/W
D
5
–
0
5
R/W
R/W
D
D
4
4
XOSC XGM [2:0]
R/W
R/W
D
D
3
3
32-KHz Freq Trim [3:0]
R/W
R/W
D
D
2
2
Reserved
R/W
D
1
–
0
1
CY7C63310
CY7C638xx
CY7C639xx
Page 19 of 68
Mode
R/W
R/W
0
D
D
0