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参数资料
| 型号： | TLC32046IFNR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC28 |
| 封装： | PLASTIC, CC-28 |
| 文件页数： | 16/56页 |
| 文件大小： | 274K |
| 代理商： | TLC32046IFNR |
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2–9
2.15.2
Primary DX Word Bit Pattern
Using 8-bit processors, the data word is transmitted in the same order as one 16-bit word, but as two bytes
with the two LSBs of the second byte set to zero.
A/D OR D/A MSB
1st bit sent
1st bit sent of 2nd byte
A/D or D/A LSB
↓
↓↓
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Table 2–2. Primary DX Serial Communication Protocol
FUNCTIONS
D1
D0
D15 (MSB)-D2
→ DAC Register.
TA
→ TX(A), RA → RX(A) (see Figure 2–1).
TB
→ TX(B), RB → RX(B) (see Figure 2–1).
0
D15 (MSB)-D2
→ DAC Register.
TA+TA
′ → TX(A), RA+RA′ → RX(A) (see Figure 2–1).
TB
→ TX(B), RB → RX(B) (see Figure 2–1).
The next D/A and A/D conversion period is changed by the addition of TA
′ and RA′ master clock cycles,
in which TA
′ and RA′ can be positive, negative, or zero (refer to Table 2–4).
0
1
D15 (MSB)-D2
→ DAC Register.
TA–TA
′ → TX(A), RA–RA′ → RX(A) (see Figure 2–1).
TB
→ TX(B), RB → RX(B) (see Figure 2–1).
The next D/A and A/D conversion period is changed by the subtraction of TA
′ and RA′ master clock cycles,
in which TA
′ and RA′ can be positive, negative, or zero (refer to Table 2–4).
1
0
D15 (MSB)-D2
→ DAC Register.
TA
→ TX(A), RA → RX(A) (see Figure 2–1).
TB
→ TX(B), RB → RX(B) (see Figure 2–1).
After a delay of four shift cycles, a secondary transmission follows to program the AIC to operate in the
desired configuration. In the telephone interface mode, data on DATA DR is routed to DR during
secondary transmission.
1
NOTE: Setting the two least significant bits to 1 in the normal transmission of DAC information (primary communications)
to the AIC initiates secondary communications upon completion of the primary communications. When the
primary communication is complete, FSX remains high for four SHIFT CLOCK cycles and then goes low and
initiates the secondary communication. The timing specifications for the primary and secondary communications
are identical. In this manner, the secondary communication, if initiated, is interleaved between successive
primary communications. This interleaving prevents the secondary communication from interfering with the
primary communications and DAC timing. This prevents the AIC from skipping a DAC output. FSR is not asserted
during secondary communications activity. However, in the dual-word (telephone interface) mode, FSD is
asserted during secondary communications but not during primary communications.
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