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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B ? SEPTEMBER 2012
Command Register
The command registers specifies the address of the target register for future write and read operations.
Table 2. Command Register
7
6
5
4
3
2
1
0
COMMAND
COMMAND
TYPE
ADD
??
FIELD
COMMAND
TYPE
ADD
BITS
7
6:5
4:0
DESCRIPTION
Select Command Register. Must write as 1 when addressing COMMAND register.
Selects type of transaction to follow in subsequent data transfers:
FIELD VALUE
DESCRIPTION
00
Repeated byte protocol transaction
01
Auto-increment protocol transaction
Reserved — Do not use
10
Special function — See description below
11
Transaction type 00 will repeatedly read the same register with each data access.
Transaction type 01 will provide an auto-increment function to read successive register bytes.
Address register/special function register. Depending on the transaction type, see above, this field either
specifies a special function command or selects the specific control-status-register for following write and
read transaction s:
FIELD VALUE
DESCRIPTION
00000
Normal — no action
00101
Proximity interrupt clear
Proximity Interrupt Clear clears any pending proximity interrupt. This special function is self clearing.
Enable Register (0x00)
The ENABLE register is used to power the device on/off, enable functions, and interrupts.
Table 3. Enable Register
7
6
5
4
3
2
1
0
ENABLE
Reserved
PIEN
Resv
Reserved
WEN
PEN
PON
Address
0x00
FIELD
Reserved
PIEN
Reserved
WEN
PEN
PON 1, 2
BITS
7:6
5
4
3
2:1
0
DESCRIPTION
Reserved. Write as 0.
Proximity interrupt mask. When asserted, permits proximity interrupts to be generated.
Reserved. Write as 0.
Wait Enable. This bit activates the wait feature. Writing a 1 activates the wait timer. Writing a 0 disables the
wait timer.
Proximity enable. These bits activate the proximity function. Writing a 11b enables proximity. Writing a 00b
disables proximity. The Wait Time register should be configured before asserting proximity enable.
Power ON. This bit activates the internal oscillator to permit the timers and ADC channel to operate. Writing
a 1 activates the oscillator. Writing a 0 disables the oscillator.
NOTES: 1. See Power Management section for more information.
2. A minimum interval of 2.72 ms must pass after PON is asserted before proximity can be initiated. This required time is enforced
by the hardware in cases where the firmware does not provide it.
Copyright E 2012, TAOS Inc.
16
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