ZSSC3018BA2C datasheet(20/51 Pages) RENESAS

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ZSSC3018 Datasheet

September 8, 2020

Figure 3.2 Interrupt Functionality: INT_setup = 11

3.4 Operational Modes

Figure 3.3 illustrates the ZSSC3018 power-up sequence and subsequent operation depending on the selected interface communication mode

(I2C or SPI) as determined by interface related first activities after power-up or reset. If the first command after power-up is a valid I2CTM

command, the interface will react as an I²C interface until the next power-on-reset (POR). If there is no valid I2C command, but an active signal

at the SS pin is detected as the first valid activity, then the interface will respond as an SPI slave. With either interface, after the voltage

regulators are switched on, the ZSSC3018’s low voltage section (LV) is active while the related interface configuration information is read from

memory. Then the LV section is switched off, the ZSSC3018 goes into Sleep Mode, and the interface is ready to receive commands. Since the

interface is always powered by VDD, it is referred to as the high voltage section (HV).

See Table 3.1 for definitions of the commands.

Figure 3.4 shows the ZSSC3018 operation in Normal Mode (with two operation principles: “Sleep” and “Cyclic”) and Command Mode including

when the LV and HV sections are active as indicated by the color legend. The Normal Mode automatically returns to Sleep Mode after executing

the requested measurements, or periodically wakes up and conducts another measurement according to the selection of the “sleep duration”

with the CYC_period (bits[14:12] in memory register 02HEX). In Command Mode, the ZSSC3018 remains active if a dedicated command

(Start_NOM) has been sent, which is helpful during calibration. Command Mode can only be entered if Start_CM (command A9HEX; see Table

3.1) is the first command received after POR.

Time

Measurement

Result

max.

threshold 1

threshold 2

Time

EOC / INT

Case A:

threshold1 > threshold2

Time

Measurement

Result

max.

threshold 2

threshold 1

Time

EOC / INT

Case B:

threshold1 < threshold2

Time

Measurement

Result

max.

threshold 1

Time

EOC / INT

INT_setup=01:

Measurement < threshold1

Time

Measurement

Result

max.

threshold 1

Time

EOC / INT

INT_setup=10:

Measurement > threshold1

INT_setup=11

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