KMA200 datasheet(11/32 Pages) NXP

11 / 32 page

KMA200_7

Product data sheet

Rev. 07 — 18 July 2008

11 of 32

NXP Semiconductors

KMA200

Programmable angle sensor

Digital output (SPI)

Standard digital output

If the standard digital output mode is conﬁgured, output data can be read with the serial

interface. Figure 7 shows the timing diagram of an interface access. The access is

enclosed by a HIGH-to-LOW and LOW-to-HIGH transition of CS.

DATA are clocked out at the falling edge of CLK and should be evaluated at the rising

edge. The output data consist of 3 bytes (24 bits). The ﬁrst two data bytes contain an error

ﬂag and 13 bits of angle information. The last data byte contains the measured

temperature as 7-bit value. Every byte features a parity bit (odd parity).

The data transmission can be interrupted at any time by deactivating CS. If, for instance,

the temperature information is not desired, the data transfer can be ﬁnished by

deactivating CS after reading the ﬁrst two data bytes.

If the error ﬂag is 0, the 13 angle data bits contain the most signiﬁcant bits of the

calculated angle. If the error ﬂag is 1, an error condition was detected. The two least

signiﬁcant angle data bits (A[1:0]) are replaced by an error code. All other angle data bits

(A[12:2]) still show the current measurement value. Depending on the special error case,

the measurement values are reliable or not. Error codes are described in Table 8.

The output driver of the DATA pin is slew-rate limited. The rise and fall times of the DATA

output can be programmed with the SL bit (ctrl EEPROM constant); see Table 12.

Complementary digital output

In complementary digital output mode the data transmitted is identical to the output data in

standard digital output mode except that the angle and temperature information data bits

are logically inverted. The error ﬂag and the error code in bits A[1:0] when the error ﬂag is

set are coded as in case of standard digital output. The parity bits also use odd parity as

standard digital output mode.

Fig 7.

Digital output coding

006aaa302

CLK

DATA

angle (MSBs)

angle (LSBs)

temperature

DATA HIGH-Z (HIGH by internal weak pullup)

Parity bits (odd parity)

Error flag

13-bit angle data

7-bit temperature data

P2, P1, P0

A12 to A0

T6 to T0

A12

A11

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