Datasheet

EEH210

v1.0 / Modification rights reserved

In the examples given in Figure 9 and Figure 10 the sensor output is DRH = ‘0110’0011’0101’0000’. For the calculation of

physical values Status Bits must be set to ‘0’ – see Chapter 5.

The maximum duration for measurements depends on the type of measurement and resolution chosen – values are

displayed in Table 9. Maximum values shall be chosen for the communication planning of the MCU.

Figure 12: No Hold master communication sequence – grey blocks are controlled by EEH210. If measurement is not completed upon

“read” command, sensor does not provide ACK on bit 27 (more of these iterations are possible). If bit 45 is changed to NACK

followed by Stop condition (P) checksum transmission is omitted.

RESOLUTION RH (TYP) T (TYP) UNITS

14 bit 16 ms

13 bit 8 ms

12 Bit 18 8 ms

11 bit 10 4 ms

10 bit 10 ms

8 bit 4 ms

Table 11: Measurement times for RH and T measurements at different resolutions

Please note: I

C communication allows for repeated Start conditions (S) without closing prior sequence with Stop

condition (P) – compare Figures 9, 10 and 12. Still, any sequence with adjacent Start condition may alternatively be closed

with a Stop condition.

6.4. soFt reset

This command (see Table 8) is used for rebooting the sensor system without switching the power off and on again. Upon

reception of this command, the sensor system reinitializes and starts operation according to the default settings – with the

exception of the heater bit in the user register (see Sect. 6.3). The soft reset takes less than 15 ms.

Figure 13: Soft Reset – grey blocks are controlled by EEH210.

6.5. user register

The content of User Register is described in Table 10. Please note that reserved bits must not be changed and default

values of respective reserved bits may change over time without prior notice. Therefore, for any writing to the User

respective default values of reserved bits and the remainder of accessible bits optionally with default or non-default values.