ZSSC3240CC1B datasheet(30/64 Pages) RENESAS

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ZSSC3240

Datasheet

Nov.27.20

Page 30

Symbol

Parameter

Conditions

Minimum

Typical

Maximum

Units

ROWI,PULL

Pull-up resistance

–

master [b]

If ROWI,PULL values greater than

3.3k

Ω were applied, the shortest

tOWI,BIT times cannot be achieved

anymore.

1.8

2.5

3.3

ROWI,LOAD

Resistive OWI line load

If ROWI,LOAD>35Ω, OWI-timing

parameter (tOWI,*) low-limits, i.e.

highest speeds are not guaranteed.

0.01 x

ROWI,PULL

–

VOWI,inL

Voltage level LOW

–

0.1

0.25

VDD

VOWI,inH

Voltage level HIGH

0.80

0.9

–

VDD

VOWI-S,LOW

Slave output level LOW

Open drain output at AOUT pin,

max. allowed current draw 5mA,

otherwise: VOWI-S,LOW >0.1*VDD

–

0.1

VDD

[a]

To switch from analog output to “OWI listen” at AOUT pin.

[b]

For the selection of ROWI,PULL, the minimum current limit of the AOUT buffer and maximal VDD supply must take into account if

OWI and analog output voltage mode are set up to work concurrently; that is owi_off = 0, cont_ANAoutn = 0, and owi_su_case = 1.

If the current limitation condition (IOUTmax, see Table 4) is exceeded, it is recommended to use the Dynamic Driving Approach for

ROWI,PULL at the OWI-master, and only switch the ROWI,PULL to AOUT when the OWI-master starts communication. This setting is

specifically recommended for the phases when the OWI-master listens to the AOUT-line, and the OWI-slave (the ZSSC3240) has

to respond, respectively.

The effective OWI properties depend on the load conditions at the OWI1 pin. Additional to Table 22, some

further applicable configurations are as follows:



For maximum operation speed (50kHz) of OWI1, the capacitive load, COWI,LOAD can be up to 1nF and the

maximum ROWI,PULL is 2.5k

Ω.



For high operation speed (10kHz) of OWI1, the capacitive load, COWI,LOAD can be up to 4.7nF and ROWI,PULL

must be

≤ 3.3kΩ.



For an equivalent frequency of 1kHz of OWI1, it should be ensured that COWI,LOAD

≤ 22nF and ROWI,PULL ≤ 7kΩ,

or for example that COWI,LOAD

≤ 66nF combined with ROWI,PULL ≤ 4.5kΩ.

Example 2: OWI Request, 1 Command Byte, no Data:

4 3 2 1

S 6 5

7 6

Slave Address [6:0]

Data Byte

5 4 3 2 1 0

4 3 2 1

S 6 5

7 6

Slave Address [6:0]

Example 1: OWI Request, 1 Command Byte, 1 Data Word:

Data Byte

5 4 3 2 1 0

7 6

Data Byte

5 4 3 2 1 0

Stop

condition

Data bit

(example: Bit 2)

Read/write bit

(write = 0)

Slave address

(example: Bit 5)

Optional

Sent by

Master

7 6

Data Byte

5 4 3 2 1 0

Start condition

Command Byte [7:0]

Data Word [15:0]

Figure 16.

OWI Command Request

ZSSC3240CC1B Datasheet(PDF) 30 Page - Renesas Technology Corp

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