ZHCSKG8A November 2019 – February 2020 CDCDB2000
PRODUCTION DATA.
Each output channel, 0 to 19, can be individually enabled or disabled by SMBus control register bits, called SMB enable bits. Additionally, each output channel from 12 to 5 has a dedicated, corresponding, OE[12:5]# hardware pin. The OE[12:5]# pins are asynchronously asserted-low signals that may enable or disable the output.
Refer to Table 8 for enabling and disabling outputs through the hardware and software. Note that both the SMB enable bit must be a ‘1’ and the OEx# pin must be an input low voltage ‘0’ for the output channel to be active.
Table 8 is only valid when the SBEN signal is low (SBEN = 0).
| INPUTS | OE[12:5]# HARDWARE PINS AND SMBus CONTROL REGISTER BITS | |||||
|---|---|---|---|---|---|---|
| PWRGD | PD# | CLKIN | SMBus ENABLE BIT (byte[2:0]) | OE[12:5]# | CK[12:5] | CK[19:13, 4:0] |
| 0 | X | X | X | X | LOW | LOW |
| 1 | 0 | X | X | X | Tristate | Tristate |
| 1 | 1 | Running | 0 | X | 0 | 0 |
| 1 | 1 | Running | 1 | 0 | Running | Running |
| 1 | 1 | Running | 1 | 1 | 0 | Running |