AS89010 datasheet(13/42 Pages) AMSCO

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db12348e_V3.11_preliminary_2017-07-06

Page 12 of 41

AS89010

V3.11

Figure 10: SYND Mode timing with Power down, EDGES > 112

idle or

standby

conversion

idle or

standby

power down

SYN

OUT0..OUT3

STATE

I²C

activity

READY

start edge

stop edge

EDGES-1

EDGES

data

fetch

power down (PD <-

’1')

power up (PD <-

’0')

Between the subsequent conversions the device alters its state to Standby or idle according to assignment

of SB bit (CREGH register). In this measurement mode it is also possible to switch the device into Power

down. If the Power down is activated, the SYN signal would be ignored and no measurement will be

performed.

The conversion time (integration time TINT) is determined by the duration between start and stop edge of

the SYN signal. The distance between the falling edges determines the duration of the integration time

TINT. It is possible to set the number of edges after which the integration time is terminated. In this way,

the synchronization can be performed on different pulsed light sources. The minimum integration time TINT

is 90μs, which corresponds to a resolution of at least 6Bit. The maximum integration time is 800ms.

In order to prevent measurement failures as a result of 'gain changing' (register CREGL:R), it is

highly recommended to set the CMD mode or the Power down mode, before activating SYNS or

SYND mode. In the case of using the Power down modus, a startup time of 500µs has to be

respected to ensure that all parts of the AS89010 are fully functional again and the

measurement does not start before awaking the AS89010 (CMD and CONT mode).

This waiting time can be prevented by inserting a "dummy" CMD mode before SYNS or SYND.

Setting of Power down mode is not needed in this case.

5.2 Power Down

In Power down the clock generator and analog part of the device are turned off. The digital part stays idle,

the full communication via the I²C interface is granted. Reading of measurement data and start of a

measurement by setting the SS-Bit in CMD Mode is possible.

Power down is configured by the PD bit in OSR register (Table 8). By setting the OSR:PD bit to “1” the

AS89010 immediately changes to Power down. By resetting the OSR:PD bit to “0” the AS89010 changes

back to the measurement/idle or Standby depending on the settings of the CREGH register. This change

to the operational state is delayed by the Start up time of about 500µs to ensure that all parts of the

AS89010 are fully functional again. Only in the CMD measurement mode a single conversion can be started

during Power down state by setting the OSR:SS bit to 1. In this case the Start up time of 500 µs between

the I2C command and the start of the conversion becomes active too. After the conversion the AS89010

changes back into the Power down state.

5.3 Standby

In Standby only the A/D converters are powered down, thus the power consumption will be reduced. The

Standby operation can be configured by the SB bit of CREGH register (Table 11).

12 Dash lines indicate variable conditions

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