ZHCSTF3I June 2007 – August 2024 CDCE913 , CDCEL913
PRODUCTION DATA
The CDCE913 or CDCEL913 has three user-definable control terminals (S0, S1, and S2), which allow external control of device settings. The devices can be programmed to any of the following functions:
The user can predefine up to eight different control settings. Table 7-1 and Table 7-2 explain these settings.
| EXTERNAL CONTROL BITS | PLL1 SETTING | Y1 SETTING | ||
|---|---|---|---|---|
| Control function | PLL frequency selection | SSC selection | Output Y2/Y3 selection | Output Y1 and power-down selection |
| SSCx [3 Bits] | CENTER | DOWN | ||
|---|---|---|---|---|
| SSC SELECTION (CENTER/DOWN) | ||||
| 0 | 0 | 0 | 0% (off) | 0% (off) |
| 0 | 0 | 1 | ±0.25% | –0.25% |
| 0 | 1 | 0 | ±0.5% | –0.5% |
| 0 | 1 | 1 | ±0.75% | –0.75% |
| 1 | 0 | 0 | ±1.0% | –1.0% |
| 1 | 0 | 1 | ±1.25% | –1.25% |
| 1 | 1 | 0 | ±1.5% | –1.5% |
| 1 | 1 | 1 | ±2.0% | –2.0% |
| FSx | FUNCTION |
|---|---|
| 0 | Frequency0 |
| 1 | Frequency1 |
| YxYx | FUNCTION |
|---|---|
| 0 | State0 |
| 1 | State1 |
| Y1 SELECTION | |
|---|---|
| Y1 | FUNCTION |
| 0 | State 0 |
| 1 | State 1 |
S1/SDA and S2/SCL pins of the CDCE913 or CDCEL913 are dual-function pins. In the default configuration, the pins are defined as SDA/SCL for the serial programming interface. The pins can be programmed as control pins (S1/S2) by setting the appropriate bits in the EEPROM. Changes to the control register (Bit [6] of byte 02h) have no effect until the pins are written into the EEPROM.
After the S1/SDA and S2/SCL pins are set as control pins, the serial programming interface is no longer available. However, if VDDOUT is forced to GND, the two control pins, S1 and S2, temporally act as serial programming pins (SDA/SCL).
S0 is not a multi-use pin. S0 is a control pin only.