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Product data sheet

Rev. 05 — 16 August 2005

11 of 31

Philips Semiconductors

KMA200

Programmable angle sensor

8.

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-low and low-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).

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

CS

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

EF

A12 to A0

T6 to T0

P2

A12

A11

EF

A7

A6

A5

P1

A0

T6

T5

P0

T0