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| 型号： | C9726AY |
| 英文描述： | ST92141 - 8/16 BIT MCU FOR 3-PHASE AC MOTOR CONTROL |
| 中文描述： | CPU系统时钟发生器| SSOP封装| 48PIN |塑料 |
| 文件页数： | 4/16页 |
| 文件大小： | 119K |
| 代理商： | C9726AY |
C9726
Clock Generator for VIA VT8371/Athlon (K7) Chipset Systems
Approved Product
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07047 Rev. **
05/03/2001
Page 4 of 16
Power Down Timing
Power down (asserting the PWR_DN# pin) is an asynchronous event in the device. When PWR_DN is brought low, the
device internally removes power from all control logic. All outputs are driven to a logic low level. The exception is the
CPU# pins which are released to a high (floating) state. It is the designer’s responsibility to ensure all system timing and
sequencing needs are met before applying and releasing this pin. It is intended to be used as a system power savings
feature and will put the device into its lowest power consumption mode while still retaining the minimum control logic
functionally needed to produce an orderly startup when PWR_DN# is released to a high state.
Spectrum Spread Clocking
See Ap Note AN-0024 for a description on Spectrum Spread Clocking.
SBW2
0
0
0
0
1
1
1
1
SBW1
0
0
1
1
0
0
1
1
SBW0
0
1
0
1
0
1
0
1
Table 3
Spread
±
0.25%
±
0.12%
±
0.37%
±
0.50%
- 0.50%
- 0.25%
- 0.75%
+ 0.25%, - 0.75%
2-Wire SMBUS Control Interface
See Ap Note AN-0022 for a description on 2-Wire SMBUS Control Interface
Serial Control Registers
NOTE:
The Pin # column lists the affected pin number where applicable. The @Pup column gives the state of the
control register at power up. Bytes are set to the values shown only on true power up.
Following the acknowledge of the Address Byte, two additional bytes must be sent:
1) “
Command Code
“
byte, and
2) “
Byte Count
” byte.
Although the data (bits) in these two bytes are considered “don’t care”, they must be sent and will be acknowledged.
After the Command Code and the Count bytes have been acknowledged, the below described sequence (Byte 0, Byte 1,
Byte2,…) will be valid and acknowledged.
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