ZSSC3123AI2 datasheet(35/63 Pages) IDT

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ZSSC3123 Datasheet

January 26, 2016

HiZ

C13

C12

T13

T12

HiZ

…

SCLK

MISO

As seen in Figure 3.11 the entire output packet is 4 bytes (32 bits). The high capacitive data byte comes first, followed by the

low byte. Then 14 bits of corrected temperature (T[13:0]) are sent: first the T[13:6] byte and then the {T[5:0],xx} byte. The last

2 bits of the final byte are undetermined and should be masked off in the application. If the user only requires the corrected

capacitance value, the read can be terminated after the 2

nd byte. If the corrected temperature is also required but only at an 8-

bit resolution, the read can be terminated after the 3

rd byte is read.

Figure 3.11

SPI Output Packet with Positive Edge Sampling

Packet = [ {S(1:0),C(13:8)}, {C(7:0)}, {T(13:6)},{T(5:0),xx}] Where

S(1:0) = Status bits of packet (normal, command, busy, diagnostic)

C(13:8) = Upper 6 bits of 14-bit capacitance data.

C(7:0) = Lower 8 bits of 14-bit capacitance data.

T(13:6) = Corrected temperature data (if application does not require corrected temperature, terminate read early)

T(5:0),xx =. Remaining bits of corrected temperature data for full 14-bit resolution

HiZ = High impedance

3.6.5

Measurement Request (MR)

A measurement request (MR) is a Sleep-Mode-only command sent by the master to wake up the ZSSC3123 and start a new

measurement cycle in both I

2C™ and SPI modes. See section 3.3.2 for more information on Sleep Mode.

3.6.5.1.

2C™ Measurement Request

The I

2C™ MR is used to wake up the device in Sleep Mode and start a complete measurement cycle starting with a

temperature measurement, followed by a capacitance measurement, followed by the DSP calculations, and then the results

are written to the digital output register. As shown in Figure 3.12, the communication contains only the slave address and the

WRITE bit (0) sent by the master. After the ZSSC3123 responds with the slave ACK, the master creates a stop condition.

Note: The I

2C™ MR function can also be accomplished by sending “don’t care” data after the address instead of immediately

sending a stop bit.

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