ZHCSLA7C December 2019 – September 2023 AM6526 , AM6528 , AM6546 , AM6548
PRODUCTION DATA
WKUP_LFOSC_XO/WKUP_LFOSC_XI - External main crystal interface pins connected to internal oscillator which sources reference clock provides a clock for low power operation in deeper sleep modes. For a list of supported low power modes for this device, please refer to Overview of Device Low-Power Modes section in the device TRM.
Figure 6-27 shows the recommended oscillator connections when WKUP_LFOSC0 is connected to an LVCMOS square-wave digital clock source. The 1.8-V LVCMOS-Compatible clock source is connected to the WKUP_LFOSC0_XI pin. In this mode of operation, the WKUP_LFOSC0_XO pin is left unconnected and should not be used to source any external components.
Table 6-24 summarizes the WKUP_LFOSC0 input clock electrical characteristics.
NAME | DESCRIPTION | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
CK0 | 1/tc(WKUP_LFOSC0_XI) | Frequency, WKUP_LFOSC0_XI | 32.768 | kHz | ||
CK1 | tw(WKUP_LFOSC0_XI) | Pulse duration, WKUP_LFOSC0_XI low or high | 0.45 × tc(WKUP_LFOSC0_XI) | 0.55 × tc(WKUP_LFOSC0_XI) | ns | |
CIN | Input capacitance | 2.178 | 2.378 | 2.578 | pF | |
IIN | Input current (3.3V mode) | 4 | 6 | 10 | μA | |
tsX | Start-up time | see(1) | ms |