DLPA2000
www.ti.com.cn
ZHCSCO5B –JUNE 2014–REVISED FEBRUARY 2018
AFE_GAIN [1:0]
AFE_SEL[3:0]
From host
VINA/3
VLED/3
SW4
AFE
PWM_IN
SW5
CMP_OUT
MUX
To host
From light sensor
SENS1
SENS2
From temperature sensor
Figure 11. Block Diagram of the Measurement System
Table 4. Recommended Configuration of the AFE for Different Input Selections
RECOMMENDED GAIN SETTING
AFE-GAIN[1:0]
RECOMMENDED SETTING OF
AFE_CAL_DIS BIT
AFE_SEL[3:0]
SELECTED INPUT
0x00h
0x01h
0x02h
0x03h
SENS2
VLED
0x01h (1x)
0x01h (1x)
0x01h (1x)
0x01h (1x)
Setting has no effect on measurement.
Setting has no effect on measurement.
Setting has no effect on measurement.
Setting has no effect on measurement.
VINA
SENS1
Set to 1 if sense voltage is >100 mV.
Otherwise set to 0 (default).
0x04h
0x05h
0x06h
0x07h
RLIM_K
SW4
0x03h (18x)
0x02h (9.5x)
0x02h (9.5x)
0x02h (9.5x)
Set to 1 if sense voltage is >200 mV.
Otherwise set to 0 (default).
Set to 1 if sense voltage is >200 mV.
Otherwise set to 0 (default).
SW5
Set to 1 if sense voltage is >200 mV.
Otherwise set to 0 (default).
SW6
0x08h
0x09h
No connect
VREF
N/A
N/A.
0x01h (1x)
Setting has no effect on measurement.
7.3.10 Protection Circuits
DLPA2000 has several protection circuits to protect the IC and system from damage due to excessive power
consumption, die temperature, or over-voltages. These circuits are described in the following sections.
7.3.10.1 Thermal Warning (HOT) and Thermal Shutdown (TSD)
DLPA2000 continuously monitors the junction temperature and issues a HOT interrupt if temperature exceeds
the HOT threshold. If the temperature continues to increase above the thermal shutdown threshold, all rails are
disabled and the TSD bit in the INT register is set. After the temperature drops below its threshold, the system
recovers and waits for the DPP to resend the DMD_EN bit.
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